[2] During the war he served with the Royal Engineers and also made appearances as a guest player for Sheffield Wednesday during unofficial wartime competitions.
Gillingham manager Archie Clark also signed four other players who had served with Boswell at Barton Stacey and played alongside him in the unit football team, namely Jackie Briggs, George Forrester, Hughie Russell and Vic Hole.
[3] Boswell missed only two matches during the 1946–47 season as Gillingham won the Kent League championship by a margin of one point.
[4] The following season the club played in the Southern Football League and Boswell was again a regular as the team finished in second place.
[2] At the end of the 1957–58 season Boswell, now aged 36, left Gillingham to play for non-league team Gravesend & Northfleet.