[3] From a young age, Hume had the instincts of a soldier, and enjoyed banding his friends together to create their own "army."

Hume attended Riverview Military Academy in Poughkeepsie, New York, and completed his education at Harvard University.

As colonel, Hume commanded the 2nd Maine Infantry during its service on the Mexican Border from June 19 to October 25, 1916.

[3] During the war, Hume was Captain of Battery B, 1st Battalion, Heavy Artillery Maine Volunteers from June 20 to March 31, 1899.

[3] During the Chemin des Dames engagement, Hume suffered from "shell concussion" and lost hearing in one ear.

[11] Colonel Hume participated in the following engagements:[11] On June 16, 1918, he was awarded the Croix de Guerre after the Battle of Seicheprey.

In his biography, "The Old Man" of the 103rd, a soldier who served with him emphasized that Colonel Hume always checked on the boys to ensure they were healthy and comfortable.

In one instance, while stationed in Cuba, Hume gave a speech to his troops and warned them to steer away from "whiskey and women".

[18] In August 1937, Hume was placed on the retired list of the Maine National Guard with the rank of brigadier general.