The Centralia Massacre was an incident during the American Civil War in which twenty-four unarmed Union soldiers were captured and executed at Centralia, Missouri on September 27, 1864 by the pro-Confederate guerrilla leader William T. Anderson. Future outlaw Jesse James was among the guerrillas.

Based on that paragraph can we conclude that this sentence is true?
Jesse James was a guerrilla in the Union army during the American Civil War.
No