Mitchell served during the Earth Alliance Civil War and commanded the EAS Apollo loyal to the dictator Morgan Clark. The Apollo waited near Mars to intercept John Sheridan's fleet, where Mitchell was ordered to relinquish command to General Robert Lefcourt. Before the Battle of Mars in November 2261, Mitchell approached Lefcourt prior to the battle and asked whether or not the general had faith in him to be able handle command of a ship in a battle on this scale. Lefcourt assured Mitchell that it was not a matter of his abilities but that the battle required a commander who understood Captain Sheridan and his methods which General Lefcourt did as he helped train him when he was a cadet. Lefcourt proceeded to compliment Mitchell, telling him that he would make a good general himself one day. During the battle, Mitchell relayed to the General the fact that ship-to-ship communications were down, and that cargo had been loaded. Lefcourt deduced something in it had sabotaged them.