Billy's offensive skills were one of the main reasons the Silver Seven won 10 straight Stanley Cups challengers in 1903, 1904, 1905, 1906. He also won the 5th Stanley Cup with Ottawa in 1909. He was inducted into the Hockey Hall of Fame in 1962. Billy won the Stanley Cup with his 2 two brothers Dave Gilmour in 1903 and Suddy Gilmour in 1903, 1904.