Lester Harper was a farmer from Pouce Coupe, British Columbia, who found himself on the frontlines of the First World War, in France. Now a new book tells his story, based on hundreds of pages of letters he sent home to his wife Mabel. Brandon Marriott, historian and author of Till We Meet Again, explains how Harper felt about the punishing conditions at the front, the staggering number of men who were killed, and his own brave actions in battle