2-1 Brothers tells the story of the Canadian 21st Battalion as they plan Courcellette's struggle in WWI. Occurring in real time, the movie follows Sgt. Reid as he has to get his men ready for the forthcoming battle. Not only must he prep his battalion Sgt. Reid must also handle the everyday difficulties of Life from the trenches, for example injuries to his men, supply difficulties, and an under age recruit who has recently been sent into the front lines.