[1][2] James Maxwell was born the fifth son of John Wallace of Kelly, Renfrewshire, a Scottish landowner and owner of plantations in the West Indies.
[2] He entered the British Army as a cornet, and receiving a lieutenant's commission in 1806, was promoted as captain in the following year.
[5] While serving at the Cape of Good Hope as captain of the 21st Light Dragoons, he, in command of a squadron, accompanied Brigadier-General John Graham's expedition, which, after a struggle of seven months, drove the Xhosa across the Great Fish River.
[6] In January 1817, he was advanced as Major, and in September 1823 was appointed Lieutenant-Colonel of the 5th Dragoon Guards (when Prince Leopold, afterwards king of the Belgians, was colonel).
On 24 June 1861, he was chosen to lead the procession attendant on the ceremonial of founding the National Monument in honour of the great hero of his house (William Wallace).