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In this case literally - he nearly did so in OTL just outside of Nashville on 31 December 1862 before reinforcing his right flank after Cleburne began pushing it back a few miles. While starting to rally his defenses from a planned attack, Col. Julius Garesche - Rosecran's chief of staff - was beheaded by a cannonball while riding next to the general. What if it had been Rosecrans himself who lost his head instead?