In 1923, Gallagher began the 1923-1924 season with the Fall River Marksmen but moved to the New York Giants after only two games. In the summer of 1924, he moved to Fleisher Yarn. After one season, he transferred to Indiana Flooring, a new team to the league which played in the New York City area. In 1927, Charles Stoneham, bought Indiana Flooring and changed the team's name to the New York Nationals. After three season under that name, Stoneham changed it again, this time to the New York Giants in 1930. However, while still using the moniker "Nationals", the team won both the ASL league and cup (Lewis Cup) titles.