Following the First World War, Carpendale commanded HMS "Benbow" from 1919 to 1921, during which time he commanded a landing party of Royal Marines from "Benbow" and "Marlborough" at the time of the Occupation of Constantinople during the Greco-Turkish War. On 6 July 1921, while commanding "Benbow", he was promoted to Rear-Admiral. He retired from the Royal Navy (at his own request) on 1 August 1923 and joined the Retired List. On 25 October 1926, he was promoted to Vice-Admiral.