[2][5] In January 1880, Proby was commissioned as 2nd lieutenant from the military college into the 109th Regiment of Foot.
[6] He was exchanged to the Coldstream Guards in April[7] and when two years later the Anglo-Egyptian War erupted, he fought with the 1st Battalion .
[9] Proby entered the British House of Commons as Member of Parliament for Saffron Walden in the January 1910 general election.
[1] He was appointed High Sheriff of Cambridgeshire and Huntingdonshire in 1923 and was a Justice of the Peace for Northamptonshire and for Hampshire.
[9] He was invested as an Officer of the Most Venerable Order of the Hospital of St John of Jerusalem (OStJ).