Extract from war diary of 10th Bn, 22nd (Cheshire) Regiment
Trenches, near Ypres
A considerable number of gas shells were sent over in the early morning first of all mustard oil, then chlorine and phosgene. A number of men suffered from the effects though there were no deaths in the battalion other units had several. Some more heavy delay action shells were fired at dugout but no damage done to it. The Battalion was relieved by the 2nd W YORKSHIRE REGT. by half platoons at ½ hour intervals starting at 9 am it was satisfactorily carried out without loss. A B C Coy and HQ to VANCOUVER CAMP D Coy remained with the transport.