| The 
war quickly reached a stalemate. Each 
side dug a complex series of damp, uncomfortable 
trenches protected by barbed wire. The 
men lived in these to shield themselves 
from observation and the machine-gun 
and artillery fire that swept the battlefields. 
In April 1915, the 1st Canadian Division 
fought the grim Second Battle of Ypres, 
in Belgium, during which the Germans 
introduced poison gas to the Western 
Front. A 
costly war of attrition followed for 
over a year and more Canadian divisions 
joined the struggle. In the late summer 
and autumn of 1916, the Canadians fought 
under gruelling conditions to advance 
only a few miles on the Somme front. 
By October 1916, the Canadian Corps had 
grown to four infantry divisions supported 
by strong artillery, cavalry, engineer, 
and auxiliary forces, a total of more 
than 80,000 men.  |  |