[5] A left back, Rosier's progress was halted by the outbreak of the First World War in 1914 and he enlisted to fight.

[6] After Brentford's election to the Third Division in 1920, Rosier made his Football League debut for the club in a 3–0 defeat to Exeter City on 28 August 1920.

[7] During the First World War, Rosier and his brother, Alfred, served with the Royal Sussex Regiment and both were captured by the Germans in July 1917 near Monchy-le-Preux.

[2] Both brothers were interned in prisoner of war camps in Douai, Dülmen and Münster before being repatriated in November 1918.

This biographical article related to association football in England, about a defender born in the 1890s, is a stub.