Shortly after the end of the war, in 1919, Wimberley, now serving with the 8th Battalion, MGC, was despatched to Russia during the Russian Civil War. In December 1919 he returned to the Queen's Own Cameron Highlanders. Wimberley chose to stay in the army during the interwar period and, in 1921, served as the assistant adjutant of the 2nd Battalion, Cameron Highlanders, then stationed at Queenstown during the Irish War of Independence. Wimberley's battalion, a Regular Army unit, was regarded by Bernard Montgomery, the brigade major of the parent Cork Brigade, to be the best troops available to act as a "flying column" to round up rebels. 1922 saw Wimberley made an adjutant of the 2nd Battalion, Camerons. Two years later he gained distinction in promotion examinations and was allowed to spend a year at Emmanuel College, Cambridge.