In losing forty-three killed and fifty-seven wounded, the marines had annihilated Ichiki’s entire attacking force of 800 men. (The rest of the detachment, numbering about 120 men, had been left behind to the east as a rear guard.) The psychological repercussions of the Tenaru action were far-reaching. That victory, and the actions on Tulagi and Gavutu two weeks earlier, had put an end to the myth of the Japanese soldier as an untouchable jungle warrior. The fanaticism of the Japanese was unnerving, but it prompted them, again and again, to fight in tactically idiotic ways.

