Why U.S. Marines Let Japanese Troops Get “Too Close” — And Killed 800 in One Night

In August 1942 at Guadalcanal's Tenaru River, U.S. Marines defied instinct by refusing to pursue attacking Japanese forces and instead let Colonel Ichiki's 900-man detachment charge directly into their carefully prepared positions. The Marines held their fire until the enemy funneled onto a sandbar in the darkness, then unleashed devastating interlocking machine guns, artillery, and canister rounds that annihilated over 800 attackers in a single night while suffering only about 40 casualties. This "let them come to you" defensive doctrine—combining fixed positions, coordinated firepower, and disciplined fire control—proved so effective it became the Marine playbook for future battles like Edson's Ridge.