Mulcahy was called Losing Pitcher by scribes who noted how often the initials “L.P.” followed his name in the box scores. He led the National League in losses for last-place Phillies teams in 1938 and 1940 but was selected to the 1940 NL All-Star squad. In 1941 he became the first major leaguer drafted by the army, and he missed the 1941-44 seasons, returning for a few appearances in 1945-47.