The Japanese were not expected to make another effort until dark but at around 16:00 a Japanese patrol was discovered that had somehow managed to infiltrate the perimeter in broad daylight and penetrate to within of General Chase's command post. A sniper fired on the command post, and fire was directed at the patrol. Major Julio Chiaramonte, S-2 (intelligence officer) of the task force, set out with four men to silence the sniper. As his party closed in, there were a series of explosions. Three Japanese had committed suicide with hand grenades, while another had committed "seppuku" with his sword. Fifteen dead officers and sergeants were counted, including Captain Baba, the commander of the Japanese battalion which made the attack the preceding night. The Japanese launched another attack on the perimeter at 17:00 but could make little progress in the face of American firepower.