[1] Born in Knutsford, Cheshire, he played for Northwich Victoria, Manchester United, Witton Albion, Sheffield Wednesday and Brentford.

[4] Capper began his football career with various clubs in the village, before joining Manchester League side Northwich Victoria.

[5] In January 1911, he joined Manchester United on an amateur contract, just three months before the team won their second First Division title.

[5] Capper was later criticised for holding onto the ball too much and failing to use his pace to beat opposing defenders, and he never played for Manchester United again.

[9] Capper served as a second corporal with the Inland Water Transport section of the Royal Engineers during the First World War.