How 840 Marines Stopped a Night Assault and Saved Henderson Field at Guadalcanal. October 1942. In the jungle south of Henderson Field, 840 exhausted Marines face more than 3,000 Japanese soldiers in coordinated night assaults designed to break the American line. For two nights, Edson’s Ridge becomes the hinge of the Guadalcanal campaign. This documentary examines how disciplined fire control, integrated weapons, leadership, and logistics allowed a vastly outnumbered force to hold ground that de