The article discusses engineer and service corps in the British Army which operated during the 18th and 19th centuries and were made up of African, African-American, and West Indian soldiers and laborers. According to the author, the existence of these corps is not readily apparent in the historical record because they depended on commissioned officers from other units for senior command and because for political reasons their funding was taken discreetly from the budgets of other units and government departments. Details on the roles of enslaved soldiers in engineer and service corps are presented. Other topics include the corps' service in Jamaica, Grenada, St. Vincent, the abolition of slavery in Great Britain, and compensation received by the soldiers.