At 21:00, a lone Japanese plane dropped eight bombs, cutting telephone wires. Once it had departed, yellow flares went up and a Japanese infantry attack was launched, supported by mortar fire. Offshore, Dechaineux' destroyers came under attack from four "Betty" bombers. 1st Squadron, 5th Cavalry, was attacked by about two reinforced platoons, which were met by heavy automatic weapons and mortar fire. The heavy jungle in this sector permitted some infiltration but the Japanese force was not strong enough to overrun the position. The main Japanese attack was delivered by 2nd Battalion, 1st Independent Mixed Regiment, from the direction of the native skidway, together with detachments from the Porlaka area, and fell on 2nd Squadron, 5th Cavalry. The troopers noticed a change in Japanese tactics. Instead of infiltrating silently, they advanced across the open, talking and in some cases singing. Their advance took them straight into anti-personnel mines and booby traps, which duly exploded, and then into the fields of fire of the Americans' automatic weapons, including several .30 water-cooled Browning machineguns, but the advance continued. The guns of the 211th Coast Artillery (AA) Battalion and 99th Field Artillery Battalion fired through the night, attempting to break up the Japanese attack from Porlaka. Shortly after midnight, Japanese barges attempted to cross Hyane harbour but were engaged by anti-aircraft guns and did not reach the American positions. A Bofors 40 mm gun position was captured by the Japanese, who in turn were driven off by the Seabees. Manning the .30s, the 5th Cavalry's gunners piled up the Japanese dead until the guns had to be moved to get clear fields of fire. One of the Browning guns that held the position was later left in its place, as a monument. Sergeant Troy McGill occupied a revetment with his squad of eight men. All were killed or wounded except McGill and another man, whom he ordered to fall back to the next revetment. McGill fired his rifle until it jammed, then clubbed the Japanese with it until he was killed. He was posthumously awarded the Medal of Honor.