The depicted person, Heinz Gerull, sent this card to his brother Friedrich. The post card was written on 12 November 1916 in the town Ruß or vicinity (presumably). The card was postmarked on 13 November 1916 in RU.. (OSTPREUSSEN). The Canadian 2-Cents stamp was stuck on it later. I think that Friedrich and Heinz came from the area of the town Ruß.