Both before and after this event he carried out his duties regardless of his personal safety under the most adverse conditions, and often under heavy artillery fire.Baillon remained with the South Staffordshires during the interwar period until 1931, as adjutant or as a staff captain.

From 1931 to 1932 he was in England, where he attended the Staff College, Camberley, where Brian Horrocks, Sidney Kirkman, Arthur Dowler, Cameron Nicholson and Nevil Brownjohn were among his classmates.

[3] In World War II, from September 1942 until November 1943 as an Acting Major-General, Baillon was Chief of staff for Persia and Iraq Command in 1942, under General Henry Maitland Wilson, its new head.

They were concerned about the influence of Fazlollah Zahedi, the general in charge of the Persian forces in the Isfahan area, who, their intelligence told them, was stockpiling grain, liaising with German agents, and preparing an uprising.

Maclean devised a Trojan horse plan: he and a senior officer would call on Zahidi to pay their respects, and then arrest him "at the point of a pistol" within his walled and guarded residence.