Thus warned , Turner detached all usable combat ships under Callaghan to protect the troops ashore from the expected Japanese naval attack and troop landing and ordered the supply ships at Guadalcanal to depart by early evening 12 November .
Turner sent all usable combat ships under Callaghan to protect the troops ashore from the expected Japanese naval attack and troop landing . He also ordered the supply ships at Guadalcanal to leave by early evening 12 November .