General Sir Robert Archibald Cassels, GCB, GCSI, DSO (15 March 1876 – 23 December 1959) was a British Indian Army officer.
Educated at Sedbergh School and the Royal Military College, Sandhurst, Cassels was commissioned into the Indian Staff Corps as a second lieutenant on 22 January 1896.
[9][10][11] In November 1917 he was appointed Commander of 11th Indian Cavalry Brigade and took his brigade on a great turning movement up the left bank of the River Tigris, outflanking the Turks and helping to bring the Mesopotamian Campaign to an end.
[12] Following the war, he briefly commanded the 18th Indian Division while it was stationed in the Middle East.
[13] Cassels was promoted to major general on 1 January 1919[14] in the Cavalry in India when he was appointed Commander of Peshawar District.