The attack at Vimy Ridge which was undertaken by the Canadian Corps (of the First Army) on Easter Monday, the 9th of April, 1917, is often seen as the first unequivocal success gained by the British (in this case Canadian) forces during the course of trench warfare.
Dulce et Decorum Est by Wilfred Owen
Lyrics for:
Forgotten Sons by Mariliion
When the Tigers Broke Free by Pink Floyd