In 1918 the Western Front finally broke open: Germany's last gamble in March, the Allied counterpunch of the Hundred Days, and an armistice that took effect at 11 a.m. on November 11. As a cartographer, I find it the year most worth following on a map, because after three years of stalemate the lines moved by dozens of miles, and these histories, memoirs and novels show what that cost the men who walked them, Americans in the Argonne included. Affiliate links; I may earn a commission at no cost to you.