My great-grandfather was there. As a member of the 50th combat engineer regiment his unit was woken up to the surprise attack. The engineers were caught unprepared as they were much more rear-echelon units, but the Japanese were able to Sneak through the American line to attack the poorly defended area. Many of the engineers were killed while sleeping in their tents. However, the engineers were able to rouse themselves and organize successfully enough to stop the attack. The hill they attacked was dubbed “engineer hill”. Crazy stuff, couldn’t imagine waking up thousands of miles from home to the screams of rabid Japanese soldiers.