premise: 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.
hypothesis: The Centralia Massacre was the execution of 25 Union soldiers during the American Civil War.
reason: My statement is definitely incorrect because there were actually 24 Union soldiers executed instead of 24. This was just a simple numerical misrepresentation.