On August 22, North Korean Premier Kim Il Sung ordered the war to be over by September 1, but the scale of the offensive did not allow for this. Groups 1 and 2 were to begin their attack at 23:30 on August 31 and Groups 3, 4, and 5 would begin their attacks at 18:00 on September 2. The attacks were to closely connect in order to overwhelm UN troops at each point simultaneously, forcing breakthroughs in multiple places that the UN would be unable to reinforce. The KPA also relied primarily on night attacks to counter the UN's major advantages in air superiority and naval firepower. KPA generals thought such night attacks would prevent UN forces from firing effectively and result in large numbers of UN friendly fire casualties.