Foster played rugby union as a centre and captained his university side,
Queen's University RFC. He also played for
City of Derry R.F.C. He was selected to play for Ireland in 1910, debuting at
Twickenham against England on 12 February 1910. He went on to play against both Scotland and France in that first ever
Five Nations championship and was later selected for the first official
British Isles team that
toured South Africa in 1910. In that tour he played in two of the tests. On his return to Five Nations rugby he played in every match of the 1911 and 1912 seasons but was absent for the 1913 championship. In 1914 he returned to play in three of the four matches for Ireland in the final championship before the
First World War and was selected in the first championship after the war in 1921, playing his last match for Ireland on 12 March 1921 against Wales. ==Career==