After the war, Jackson was briefly assigned to forts in New York, and then to Florida during the Second Interbellum of the Seminole Wars, during which the Americans were attempting to force the remaining Seminoles to move West. He was stationed briefly at Fort Casey before being named second-in-command at Fort Meade, a small fort about thirty miles south of Tampa. His commanding officer was Major William H. French. Jackson and French disagreed often, and filed numerous complaints against each other. Jackson stayed in Florida less than a year.