 On 28 August 1943, Mackay once again assumed command of New Guinea Force.This time, important operations were being undertaken in the Battle of Finschhafen and Mackay's period of command was marred by disagreements with General Douglas MacArthur's staff over the reinforcement of Finschhafen.Junior commanders felt that Mackay should have been more forceful, and should have enlisted the help of his superior, Blamey, at an earlier stage.