1917
Canadian army innovations in trench warfare (careful planning, creeping artillery barrages followed closely by troop assaults, and machines guns used in indirect fire) helped to secure victories at Vimy Ridge and Passchendaele.
"Flash Spotting" and "Sound Ranging": Jan-Mar 1917 American Declaration of War: 6 Apr 1917 Billy Bishop Wins Military Cross: 8 Apr 1917 Vimy Ridge: 9 Apr 1917 Conscription Crisis: 1917 Russian Revolution: 25 Oct 1917 Halifax Explosion: 6 Dec 1917 Armistice of Brest-Litovsk: 10 Dec 1917