Rising Up In Illinois

From: Rising Up from Indian Country:...:

John Leigh and John Kelso, an army private working the farm in his free time, fled ...and Private John Kelso came running away from the Winnebago attack.

According to Early Chicago:

Kelso, John  U.S. Army private at Fort Dearborn, enlisted in December 1805; accepted discharge on Dec. 17, 1810, when his term expired; stayed to be a tutor to the Kinzie children and then a field hand on Leigh’s farm; on April 6, 1812, marauding Winnebago attacked and he escaped with John Leigh, and alarmed the garrison at the fort; rejoined the army May 3 as a private and was killed in action at the massacre of Aug. 15.

An 1812 service record for a John Kelso:

Source