That night the Japanese forces formed up for a counterattack, which started at about 19:30. Small units were sent in to infiltrate the U.S. lines in preparation for a full-scale assault. The assembling forces were broken up by concentrated artillery fire, and the assault never took place. Another attempt, a large "banzai attack", was made at 03:00 and met with some success, killing 45 Americans and wounding 128. With support from the destroyers "Schroeder" and "Sigsbee", the Marines killed 325 Japanese attackers.