Operation Mandrake, also known as the Battle of Oberon, was a 2946 United Empire of Earth (UEE) military offensive against the Vanduul. Led by Admiral Ernst Bishop of the 65th Battle Group, it took shape when the UEE Navy received credible intelligence that a large group of Vanduul was preparing to launch a mass invasion. Bishop dispatched a strike team to sweep the system and engage the Vanduul as soon as they appeared. While these forces engaged the Vanduul in battle, the UEES Retribution moved into position to block potential escape routes and then proceeded to destroy the remaining Vanduul fleet, leading to a conclusive UEE victory.