 The Kennesaw House was one of the only buildings in Marietta not burned to the ground during William Tecumseh Sherman's Atlanta Campaign, partly because Fletcher was a Mason, and his son-in-law was a Union spy.The building, like many others on the Marietta square was converted to a war hospital for the confederate army.Many wounded soldiers were transported to Marietta after the battle of Antietam which was the bloodiest battle in Georgia.