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Summary: 22 April 5pm to midnight

New page The gas valves are opened

Un nuage jaune-vert": A yellow-green cloud engulfs the French

Canadians witness the green cloud

A German long-range bombardment of Ypres starts up

3rd Canadian Brigade reserves 'Stand To Arms'

Updated German accounts of the first effects of the gas cloud

The gas cloud rolls through the French trenches

Updated The German infantry advances

13th Canadian Battalion responds to the German attack

Canadian 2nd Brigade reports some heavy shelling

Updated German soldiers describe the infantry advance

The Allied front line is broken: the way to Ypres is open

A company of 7th Canadian Battalion moves forward from the 2nd Brigade reserve

Updated German soldier's account: from the reserve into the battle

Updated Canadian Engineers prepare canal bridges for demolition

1st Brigade Canadian Field Artillery moves from the reserve

Updated The German XXVI. Reserve Korps reaches its first objective: Pilckem Ridge

10th Canadian Battalion moves forward from divisional reserve

Updated German account of the scene behind the advance

Updated 3rd Canadian Brigade and divisional artillery ordered to assist the French

14th Canadian Battalion moves to Mouse Trap Farm

Updated German 51. Reserve Division captures Langemarck

Updated Left of the Canadian line in danger of envelopment

Updated Canadian 3rd Brigade to be ready to counter-attack

Updated 1st Canadian Division's reserve battalions under orders to move at a moment's notice

New page Gassed civilians arrive at a British Casualty Clearing Station

New page The Germans capture four British heavy guns in Kitchener's Wood

The German advance reaches the Yser Canal at Steenstraat and Het Sas

A German soldier's account on reaching the canal

The French organise a counter-attack from Boesinghe

3rd Canadian Brigade requests support from 2nd Brigade

Response of Second British Army headquarters to the German attack

Response of the British 28th and 27th Divisions to the German attack

Updated The French counter-attack towards Pilckem

German 52. Reserve Division attacked south of Pilckem

Canadians report that enemy fire has slackened

Three gaps in the line between the Canadian Division and the Yser Canal

Updated 2nd Canadian Brigade Reserves Move to Assist 3rd Canadian Brigade

German XXVI. Reserve Korps ordered to hold its positions

German pause in the battle gives the Allies time to bring up reserves

German air reconnaisance reports on Allied reinforcements

Updated French attacked on Poelcappelle road but Canadian line holds firm

Updated 3rd Brigade Canadian Field Artillery batteries ordered to withdraw

The gallantry of Lance-Corporal Fisher, VC

Canadian Engineers preparing canal bridges for demolition

Updated 3rd Canadian Brigade to organise a counter-attack at Kitchener's Wood

Updated 10th and 16th Canadian Battalions ordered to counter-attack at 11.30pm

Updated The Canadians begin the counter-attack at Kitchener's Wood

The French order troops to move from the Army reserve

The British Town Major prepares for a withdrawal from Ypres

Updated Allied losses by the end of the day

Updated German gains by the end of the day