Bill Mosienko would make a relatively quick debut into the National Hockey League at the age of 20 in the 1941-42 season, as the events of World War II would deplete the rosters of the premier league of Hockey. Dubbed “Wee Willie” due to his short stature, Mosienko would blossom in the 1943-44 season with a 70 Point season, and the season after would see him paired with the Bentley brothers to form the “Pony Line,” a moniker derived from all three of the players being a little vertically challenged. The trio would become one of the best lines in the NHL, and Mosienko would benefit with a pair of Second Team All-Star Selections (1945 & 1946).