 During World War I, he moved to the south coast to work in the Southampton shipyard of Harland and Wolff, where he played in their works team which won the South Hants War League in 1919.In May 1919, he joined Southampton as a professional footballer and made his Southern League in the first match of the 1919–20 season, a 1–1 draw with Exeter City.Fenwick retained his place at right half for the first six matches, after which he was in and out of the side, with Percy Prince usually taking his place, until November when fellow former Harland and Wolff employee, Arthur Andrews took over at right half.