Canadian National Vimy Memorial, France

Canadian National Vimy Memorial on the Vimy Ridge.

The Canadian National Vimy Memorial is a memorial to all Canadians who served their country in battle during the the Great War of 1914-1918. 60,000 Canadians were killed. Over 11,000 of those killed died in France but they have no known grave. The Canadian National Vimy Memorial bears the inscribed names of 11,168 missing Canadians, killed in action in France but whose remains have not been found or identified.(1)

Origins of the Vimy Monument

A National Memorial

Eight sites on the former Western Front battlefields were given to the nation of Canada for the commemoration of her war dead and all those Canadians who fought there. Five sites were in France and three sites were in Belgium. The Canadian Battlefields Memorials Committee was set up in 1920 by the Canadian Government. This commission was to carry out the organization and administration for a competition to come up with ideas for these eight memorial sites. Initially the idea was to have the same memorial at each site, so that no single site would be seen to appear more important than another.

Ideas for the Canadian National Memorial

A competition for the design of a Canadian memorial was won by a sculptor from Toronto, Walter Seymour Allward. His winning entry was one of 160 ideas submitted to the competition. Of the 160 ideas, 17 shortlisted entries were produced as plaster models. Generally the designs incorporated a single tower, but Allward's design had two pylon towers.

Allward's design was to include two pylon towers to rise skywards, one for Canada and one for France, two countries united in their sacrifice to the Great War.
The two pylon towers for the Vimy Memorial.

Allward was chosen as the winner in October 1921 by the Canadian Battlefields Memorials Committee. The Commission then decided that, because Allward's design was the winning entry, it would be too complicated and costly a monument to put at each of the eight memorial sites. Instead of having the same design at each site, therefore, it was decided to have Allward's design at one site, the design of the runner-up, Frederick Chapman Clemesha at another, and smaller monuments at the other six sites.

A design by Frederick Chapman Clemesha was the idea for a single tower-like structure with the head and shoulders of a soldier in a pose standing with “reversed arms”. This memorial was chosen and constructed as the St. Julien Memorial at Vancouver Corner in the Ypres Salient battlefields (see Related Links below.)

A Site for the Winning Memorial

The Canadian Government decided that the winning memorial design should be erected as a national memorial in Europe to honour the many thousands of Canadians who had fought with the Canadian Expeditionary Force (C.E.F.) on the Western Front of 1914-1918. Most especially, it would commemorate those who were killed.

In the discussion about where to locate the memorial General Sir Arthur Currie suggested that a national monument should be located on the former July 1916 battlefield of Hill 62, known as Mount Sorrel, near Ypres in Belgium. General Currie had commanded the Canadian 1st Division from mid 1915 and the Canadian Corps from June 1917.

The final decision was made to place the national monument on one of the five Canadian commemorative battle sites in France. It was decided that the monument would be situated on the imposing ridge of high ground at Vimy Ridge north of Arras. This had been the scene of a successful attack by the Canadian Expeditionary Force (C.E.F.) in the spring of 1917 at the Battle of Vimy Ridge (9th to 12th April) during the Battles of Arras, 1917. On the left wing of the Allied attack consisting of Canadian and British Army units, this battle was the first time the four divisions of the C.E.F had fought together as a single formation.

The Memorial Park, a Gift from France

French and Canadian flags flying at the Vimy Memorial.
French and Canadian flags flying at the Vimy Memorial.

In addition to the land already granted to Canada at the former Vimy Ridge battlefield site, the Canadian Government asked France about the possibility of obtaining more ground for the siting of the national memorial. The Canadian Prime Minister at the time, William Lyon Mackenzie King, suggested that a larger battlefield site could be preserved for future generations as a memorial park.

In December 1922 the French Government granted a larger area of land on the crest of the ridge to the Canadian nation “in perpetuity”. The donation of the land was accompanied by conditions from the French Government that the land was only to be used and maintained as a memorial park and that there would be a Canadian memorial to commemorate Canada's war dead of the 1914-1918 Great War. The area of ground for the memorial park was 117 hectares (290 acres) of land.

Location of the Monument on Hill 145

View looking south-west from the Vimy Memorial towards Mont St. Eloi on the horizon.
View looking south-west from the Vimy Memorial towards Mont St. Eloi on the horizon.

The monument itself was to be constructed on Hill 145, so called because it was the highest point of the Vimy Ridge at 145 metres (476 feet) above sea level. The ridge runs in a direction from Givenchy-en-Gohelle in the north-west to Farbus in the south-east. On its western side the Vimy Ridge rises gently from Neuville-St.-Vaast to its high point at Hill 145, where there is a much steeper drop to the Douai Plain on its eastern side.

The German Army Secure on the Ridge

Following the First Battle of Artois (27th September - 10th October 1914) the German Front Line had been established by the I Bavarian Reserve Corps on the highest western end of the ridge, protecting the magnificent view across the Imperial German Army's rear areas and their lines of communication converging on Lille and Douai. As a naturally occuring, strategic line of defence it was crucial for the German Army to hold on to it. The French Tenth Army tried to dislodge the Germans twice in 1915 without long-term success and at tremendous loss of over 100,000 casualties. In the Second Battle of Artois (9th May - 18th June 1915) the French 1st Moroccan Division had gained a foothold at Hill 145, but could not hold on to it. The second major offensive by the French Tenth Army to capture the Vimy Ridge was the Third Battle of Artois (25th September - 15th October 1915) but the ridge remained in German hands.

From February 1916 the British Army took over the sector from the French. This was the British XVII Corps. An attack by units of the German I Bavarian Reserve Corps in May 1916 pushed the British a little further down the western slope of the ridge, despite fierce British resistance. The Germans managed to capture some British tunnels and mine craters including the large Broadmarsh Crater.

The Canadian Corps Takes over the Sector

The Canadian Corps took over from the British XVII Corps in this sector of the Western Front from October of 1916. Anticipating an Allied attack on the ridge, the German line at the Hill 145 sector was reinforced by the insertion of the 79th Reserve Division on 26th February 1917. This division had been brought from the Eastern Front to take over the ridge sector between Givenchy-en-Gohelle to Thélus, thus bolstering the German defence on this important ridge. The three regiments in 79th Reserve Division had been newly formed in November 1914 and were mostly made up of experienced infantrymen from prestigious Prussian Guards regiments who had recovered from wounds received in the early weeks of the war.

Canadians Capture Hill 145

The mourning figure of “Mother Canada” on the Canadian National Vimy Memorial. She stands on the objective for the Canadian Corps, successfully won at the Battle of Vimy Ridge. Winning this high ground gave the Allies a view across the German rear areas on the Lens-Douai plain. The Double Crassier slag heaps at Loos-en-Gohelle can be seen on the horizon.
The mourning figure of Mother Canada on the Canadian National Vimy Memorial.

At the start of the Battle of Arras on 9th April 1917 all four divisions — 1st, 2nd, 3rd and 4th Divisions — of the Canadian Corps took part in the Battle of Vimy Ridge (9th 12th April 1917), attacking the German Front Line between Souchez and Écurie. British divisions went into the attack on the right of the Canadians. In a well-rehearsed attack, not without heavy casualties, the Canadians did succeed in pushing forward across the German first, second and third lines to the far side of the ridge by 12th April. The German commanders on the plain in the Second Position (2. Stellung) could see figures moving about on the skyline, these being Canadians. It was decided to make an orderly evacuation from the Second Position and wounded at the casualty clearing station at Vimy were bundled into lorries and driven further to the rear. Ammunition and supply dumps along the railway line east of the ridge were systematically destroyed by German pioneers as the Germans moved out.

Design of the Memorial

The Pylons

The twin pylons viewed from the southern side of the memorial. The figure of the grieving father is seen in the lower right corner.
The twin pylons viewed from the southern side of the memorial.

The two pylons stand 120 feet (30 metres) high from the base of the memorial. They represent Canada and France; one pylon has a carving of the maple leaf for Canada, the other plyon has the fleur-de-lis for France. Both countries shared the sorrow and sacrifice of war.

Sculpted Figures

There are 20 sculpted human figures on the monument.

The Chorus: A group of eight figures high up on the top of the two pylons represent Justice, Peace, Hope, Charity, Honour, Faith, Truth and Knowledge. Peace is the highest figure on the monument, reaching upwards with a torch.

The Spirit of Sacrifice: Between the pylons the group of two figures comprises a dying soldier who has passed a torch to a comrade.

The Defenders: Two groups of figures located at each end of the front wall comprise seven figures called The Defenders. The group of three figures called Breaking of the Sword is on the south corner of the front wall. The group of four figures called Sympathy of the Canadians for the Helpless is at the north corner of the front wall. Above each group a gun barrel with laurel and olive branches represents peace.

The figure of Peace at the highest point of the memorial at the top of one of the pylons.
The figure of Peace at the highest point of the memorial at the top of one of the pylons.

The Mourning Parents: Two reclining figures on the southern (reverse) side of the memorial, located either side of the steps, represent the mourning mothers and fathers of Canada's war dead.

“Mother Canada” or “Canada Bereft”: A female figure draped in a cloak stands alone on the wall at the north-eastern side of the memorial. She bows her head and is looking down at a stone sarcophogus, representing Canada's war dead, at the base of the 24 foot (7.3 metres) wall below her. The magnificent view across the Douai plain and the location of the old enemy of the time spreads out before her. This figure is called Mother Canada or Canada Bereft, representing the nation of Canada mourning for her dead. The figure was carved from a single 30 tonne block of limestone.

Sarcophagus

A stone sarcophagus is situated at the foot of the front wall of the memorial, which rises above it to 24 feet (7.3 metres). A Brodie steel helmet, as worn by the Canadian soldiers, a sword and laurel branches lie on the sarcophagus.

Memorial Construction

Detail of one of the parents, the grieving mother, on the Vimy Memorial.
Detail of the grieving mother on the Vimy Memorial.

The monument was built of limestone, which was found by Walter Allward after a long search for a suitable stone. He found it in a Roman quarry near the town of Seget in the country nowadays known as Croatia. The stone from this quarry had been used by the Roman Emporer Diocletian for his palace at Split. The Seget stone to build the Vimy memorial was transported to France by sea, rail and lorry. The construction cost about 1.5 million Canadian dollars.

The first deliveries of stone for the construction arrived on site in 1927. The large blocks for the human figures did not start to arrive at the site until 1931. The work to complete the memorial took a total of eleven years from when Allward started work on the project in 1925. During the period of construction of the memorial the Imperial War Graves Commission (2) employed French and British ex-Servicemen as staff to lay out the landscaping and roads in the memorial park.

Allward and the structural engineers assigned to the project constructed the monument using a frame of cast concrete to which the Seget limestone was bonded. The foundation of the memorial is made up of about 11,000 tonnes of concrete with many additional tonnes of reinforced steel. The memorial base and the two pylons were constructed using 6,000 tonnes of limestone from Seget. Each of the 20 human figures was carved on site by sculptors working from smaller scale plaster models made by Allward. Each figure was carved at the memorial site under the cover of a temporary type of studio.

Allward's dream to create a monument which would last for many hundreds of years was not to be, however, as the stone and concrete did not react well when bonded together. Within sixty years there were problems with the limestone and its concrete framework. There was erosion in the limestone due to water flowing from cracks in the structure, water damage to the concrete foundations and water entering the gap between the concrete framework and the limestone facing. A major renovation had to be carried out from 2001 (see below).

Names of the Missing Canadians

Aerial diagram of the Vimy Memorial. The letters A to Z indicate the location of the names carved on the walls at the base of the memorial for the missing Canadian servicemen in France.CWGC
Aerial diagram of the Vimy Memorial.

The Canadian Government and the Canadian Battlefield Memorials Commission wanted to have the names of more than 11,000 Canadians, with no known resting place in France, carved on the this national memorial. This had not been a feature of the original design. At first Allward was unhappy about carving names on the actual memorial, but after further discussion it was agreed that the names would be included on the memorial. From the early 1930s the names of 11,285(3) Canadians missing in action in France were inscribed on the walls around the base of the monument in a font specially designed by Allward.

The names of the missing are recorded in the Debt of Honour register in the care of the Commonwealth War Graves Commission. The records can be searched for online in the Cemetery Reports. See the bottom of this page for a link.

Among the names of the missing are four Canadian Victoria Cross winners:

Search for Names on the Vimy Memorial

Search the “Debt of Honour” Register held by the Commonwealth War Graves Commission for names carved on the Vimy Memorial. Go to this link and look in the Cemetery Records button at:

Website: CWGC Cemetery Record Search: Vimy Memorial

Dedication Ceremony, July 1936

Pilgrims from Canada

The Government of Canada issued over 6,000 free Special Vimy Passports. These passports were provided for people who wanted to make the pilgrimage to France for the unveiling ceremony of the Vimy Memorial and visits to other sites of Canadian sacrifice. Over 6,000 pilgrims set sail for France on five ocean-going steamships, leaving the port of Montreal in Canada on 16th July 1936. The five ships were the S.S. Montrose, S.S. Montcalm, S.S. Antonia, S.S. Ascania and S.S. Duchess of Bedford. The S.S. Montrose also carried 300 wreaths to be laid at Canadian sites on the 1914-1918 Western Front battlefields during the pilgrimage visit. Over 1,000 Canadians also travelled from England.

Unveiling Ceremony

At the dedication ceremony a Union Jack was draped over the lone figure of “Mother Canada”. The view of the Lens-Douai plain stretches out before her.
Mother Canada stands at the north-eastern side of the memorial, with the view of the Lens-Douai plain stretching before her.

The date of the dedication and unveiling ceremony was 26th July 1936. There was a huge crowd of approximately 100,000 people present at the ceremony. Many thousands of them were of Canadian, British and French ex-Servicemen. About 8,000 Canadian Veterans had travelled there from Canada. There were family members of the surviving Veterans and their comrades who had been killed, widows and mothers, dignitaries and royalty. There were also 50 children from the five French communes which had donated the land as a gift to Canada, and another 200 children from Arras.

The memorial was unveiled by King Edward VIII as King of Canada. As Prince of Wales before he was crowned king, Edward had been on the Staff of the Canadian Corps in France during the war. The President of France, Monsieur Albert Lebrun was present to participate in the official unveiling. During the ceremony King Edward pulled a cord to release the Union Flag (Union Jack) which was covering the statue of “Mother Canada” on the northern wall of the memorial.

National Historic Site of Canada

The Canadian National Vimy Memorial at Vimy Ridge on the 1914-1918 Artois battlefields, northern France.
The Canadian National Vimy Memorial at Vimy Ridge on the 1914-1918 Artois battlefields, northern France.

In 1996 the Vimy Memorial and the battlefield site surrounding it was established as a National Historic Site of Canada. There are over 950 National Historic Sites of Canada. All but two of the sites are located in Canada and the two sites located outside Canada are the Canadian Nationa Vimy Memorial and the Beaumont-Hamel Newfoundland Memorial on the Somme battlefield (see Related Links below).

The site is maintained by Veteran Affairs Canada.

Renovation of the Monument

View looking north-east from the position of No-Mans-Land and the Canadian Front Line at the start of the Battle of Arras on 9th April 1917. The pylons of the memorial are situated on the strongly held German position at the eastern edge of the ridge at Hill 145.
View looking north-east from the position of No-Mans-Land between the Front Lines at the start of the Battle of Arras on 9 April 1917.

Cracks and water damage created structural problems and the monument underwent a massive renovation between 2001 and 2006 at a cost of 20 million Canadian dollars. the same Seget limestone was used to make the renovation and repairs. Under the direction of the Canadian Battlefield Memorials Restoration Project the memorial at Vimy was one of 13 Canadian battlefield memorial sites in France and Belgium to have renovation work carried out.

The Canadian National Vimy Memorial was rededicated by Queen Elizabeth II on 9th April 2007. The ceremony was attended by Prince Philip, the Duke of Edinburgh, Canadian Prime Minister Stephen Harper and French Prime Minister Dominique de Villepin. Thousands of people gathered at the memorial for the ceremony, which not only marked the completion of the renovation, but was also the 90th anniversary of the Battle of Vimy Ridge in April 1917.

Memorial Park Preserved Trenches, Tunnels and Craters

Trenches

Section of preserved trenches at the Vimy Memorial Park.
Section of preserved trenches at the Vimy Memorial Park.

The site of the memorial park comprises an area where a section of original Allied and German trenches has been preserved using concrete sandbags and duckboards. This area is open for visiting at all hours. The preserved section of trenches in the Vimy Memorial Park is one of the few places on the old Western Front where visitors can walk though an “original” section of Allied and German Front Line Trenches.

It was during the construction of the Vimy memorial that the principal Canadian engineer working on the site, by the name of Major Unwin Simson, suggested that some of the trenches could be preserved in a more permanent way. This would help prevent naturally occuring damage to them by the weather and undergrowth and the number of visitors wishing to walk through them. While he was waiting for the limestone to arrive on its journey from Seget, Major Simson tasked his workers to rebuild a section of the Allied and the German trenches using sandbags filled with concrete.

Preserved WW1 Trenches at Vimy Memorial Park

Tunnels

Grange Subway Tunnel entrance at the Vimy Memorial Park.
Grange Subway Tunnel entrance at the Vimy Memorial Park.

At the same time as Major Unwin organized the rebuilding of the trench sections in the late 1920s, the entrance to Grange Tunnel Subway, one of the tunnels dug by the Allies on the Vimy Ridge, was rebuilt with concrete. Part of this tunnel was cleared and made safe for visitors and electric lighting was put in.

In the 1980s some of the many tunnels dug into the ridge were explored and made safe for visitors.

A guided visit to the tunnels can be made by prior appointment or by booking on arrival at the Vimy Interpretive Centre (see below). Visiting the tunnels is subject to the weather (the ground can be dangerous when wet).

Craters

Cratered ground at the Vimy Memorial Park.
Cratered ground at the Vimy Memorial Park.

Much of the ground in the memorial park was cleared of surface battlefield debris but was deliberately left in its damaged state. Visitors will see the cratered landscape which characterized the battlefields of the Western Front. Pine trees grow in parts of the park and some areas are not accessible to walk through in order to maintain their preserved state and for public safety. Unexploded munitions are likely still under the surface of the ground in parts of the site.

Visitors are respectfully asked only to walk on marked or designated pathways throughout the site.

Interpretive Centre, Vimy Memorial Park

Visitors at the Interpretive Centre in the Vimy Memorial Park.
Visitors at the Interpretive Centre in the Vimy Memorial Park.

The Vimy Interpretive Centre was officially inaugurated at the Vimy Memorial Park on 9th November 1997 and is administered by Veterans Affairs Canada.

Vimy Interpretive Centre

Free Guided Tours

Guided tours of the tunnels and trenches are available free of charge, subject to availability. Tours last for about 50 minutes.

For a group of less than 10 people tours are available on a first come, first served basis. Go to the Interpretive Centre to arrange your tour.

For a group of 10 or more people a reservation is recommended. Up to 25 people can be accommodated in a tour group of the tunnels and trenches.

Children under 12 years of age must be accompanied by a parent or guardian. Suitable footwear is recommended. Tours are not recommended for persons with reduced mobility or claustrophobia.

Enquiries regarding reservations and visitor information can be made to:

Email: vimy.memorial@vac-acc.gc.ca

Telephone: (from Canada) 011 33 3 22 76 70 86; (from Europe) +33 3 22 76 70 86

Website: www.veterans.gc.ca Canadian National Vimy Memorial

Address: Canadian National Vimy Memorial, 62580 Vimy, France

Cemeteries on the Site

Canadian Cemetery No. 2, located in the Vimy Memorial Park.
Canadian Cemetery No. 2, located in the Vimy Memorial Park.

There are two British military cemeteries in the memorial park, maintained by the Commonwealth War Graves Commission.

Canadian Cemetery No. 2

Givenchy Road Canadian Cemetery

Vimy Memorial Location

The memorial is located near the village of Vimy about 5 miles (8 kilometres) north-east of Arras on the N17 to Lens. Just south of the village of Vimy the memorial is signposted. The memorial, the Vimy Interpretive Centre and the location of the preserved trenches and tunnels are well signposted.

(Please note that the aerial image of the memorial on the location map includes the scaffolding for the renovation work which was completed in 2006.)

Latitude N 50° 22' 45" ; Longitude E 2° 46' 23"

Opening Hours

The Memorial Park is accessible to the public at all hours of the day. Access to the site is free of charge. Access to the Vimy Memorial and the two British military cemeteries on the site is available at all hours of the day.

Visitors are respectfully requested not to walk on the grassed areas near the memorial and only to use the paved paths.

Two parts of the site have opening hours. These are the Interpretive Centre and the Grange Subway tunnel. The visitors' Interpretive Centre with guided tours of the tunnels available are:

Guided tours of the tunnels and trenches lasts for approximately 50 minutes. Each child under 12 must be accompanied by an adult. The ground is uneven and the visit goes down to a depth of 10 metres underground.

Wheelchair Access

Paths are provided as an alternative to steps at the Vimy Interpretation Centre and through the centre of the site of the preserved trenches. The trench system itself and the tunnels are not wheelchair accessible.

Parking

There is ample free parking for cars and coaches at the site at the memorial and at the Interpretive Centre. There is a gate across the entrance to the car park next to the Interpretive Centre. This car park is closed to vehicles at the times when the Interpretive Centre is closed (see opening hours above), but visitors can park outside this gate and walk through to visit the preserved trenches.

Toilets

There are toilets available for visitors next to the Vimy Interpretive Centre, open during the hours given above.

There are toilets near to the Vimy Memorial are usually open during the summer season and at core visiting times as given above.

Queries & Information Contact

For queries regarding opening hours or for any questions about the visitor information at the site, you can contact Veteran Affairs Canada on the following web page:

Website: www.veterans.gc.ca Vimy

Related Topics

National Historic Site of Canada: Somme Battlefield

Newfoundland Caribou Memorial at Newfoundland Park, Beaumont-Hamel, Somme battlefield in France.

Find out about the other National Historic Site of Canada located in France. This was the place where the Newfoundland Regiment was in action and suffered huge loss in casualties on the first day of the Battle of the Somme, 1st July 1916. At that time Newfoundland was a Dominion of the British Empire. In 1949 it became a province of Canada.

Newfoundland Memorial Park, Beaumont-Hamel, France

St. Julien Memorial at Vancouver Corner, Flanders, Belgium

Canadian St. Julien  Memorial at Vancouver Corner, Ypres Salient battlefields, Belgium.

The memorial designed by Frederick C Clemesha, the runner-up in the competition to design a national memorial for the Canadian battlefield memorial sites, was selected for one of the three Canadian memorial sites in Flanders. The memorial commemorates the part played by the Canadian Expeditionary Force (C.E.F.) during the Second Battle of Ypres in April-May 1915:

Canadian St. Julien Memorial at Vancouver Corner

Canadians Missing in Action in Flanders, Belgium

The Menin Gate Memorial to the Missing in Ypres (Ieper), Belgium.

The names of 7,000 servicemen serving with the Canadian Expeditionary Force (C.E.F.) and missing in action in Flanders, Belgium, are inscribed on the Menin Gate Memorial to the Missing in Ypres (Ieper).

Menin Gate Memorial to the Missing, Ypres (Ieper)

Further Reading

Cover of Vimy Ridge - Arras guidebook

Vimy Ridge: Arras (Battleground Europe Series)

by Nigel Cave

208 pages. Pen & Sword Books (first printed by Leo Cooper), 1996. ISBN-10: 0850523990 and ISBN-13: 978-0850523997

Cover of Underground War Vimy Ridge to Arras

The Underground War: Vimy Ridge to Arras: 1 [Hardcover]

by Phillip Robinson (Author) and Nigel Cave (author)

360 pages. Pen & Sword Military; First Edition edition (19 May 2011). ISBN-10: 1844159760 and ISBN-13: 978-1844159765

Cover of Vimy Ridge 1917

Vimy Ridge, 1917: Byng's Canadians Triumph at Arras (Campaign) [Paperback]

by I.A.J. Turner (Author) and Peter Dennis (Illustrator)

96 pages. Osprey Publishing (10 May 2005). ISBN-10: 1841768715 and ISBN-13: 978-1841768717

Acknowledgements

(1) and (3) The number for those missing in action and named on the memorial as at 2011 is taken from the register of names according to the Commonwealth War Graves Commission. The number of names actually inscribed on this memorial is 11,285. This number now includes 116 individuals whose bodies have been found and identified since the memorial was built with the carved names of the missing.

(2) Formerly the Imperial War Graves Commission, the Commission was renamed the Commonwealth War Graves Commission in 1960.

(CWGC) Diagram of the Vimy Memorial courtesy of the Commonwealth War Graves Commission.

Veterans Affairs Canada www.veterans.gc.ca

Vimy Ridge: Arras, Battleground Europe, by Nigel Cave, Pen & Sword Books (first printed by Leo Cooper), 1996, ISBN 0 85052 399 0

Die 79 Infanterie-Division in der Osterschlacht bei Arras, von Joseph Ahlhaus