In World War I, Carter was imprisoned in Wormwood Scrubs as a conscientious objector, and then spent time in Princetown Work Centre in the former Dartmoor Prison.

[5] From 4 September 1918 to 11 June 1919 he was a 'brother' on the staff of Wallingford Farm Training Colony, an institution run by the National Union for Christian Social Service for 'difficult' boys mainly referred by Boards of Guardians.

[6] In 1921, Carter was handed over leadership of Hampstead Bible School, originally to be on a temporary basis until a more suitable person was available to fill the opening.

Howard Carter left the Hampstead Bible School in 1948[9] and moved to the United States where he eventually married Ruth (Fisher) Steelberg.

Carter spent the rest of his life in the U.S., and began to travel extensively as a preacher until his death in Springfield, Missouri, in 1971.