The first Americans rushed to stop the North Korean advance: 540 soldiers, teenage draftees, armed with weapons that bounced off enemy tanks. They lasted six hours.
When North Korea invaded on June 25, 1950, the nearest American forces were occupation troops stationed in Japan — comfortable rear-echelon soldiers who had not seen combat since World War II ended five years earlier. General Douglas MacArthur ordered a small advance unit rushed immediately to Korea to slow the North Korean advance and buy time for reinforcements. The unit was called Task Force Smith, after its commander, Lieutenant Colonel Charles Bradford Smith.
Task Force Smith consisted of 540 men, most of them teenagers with minimal training. They had 120 rounds of ammunition each and two days of rations. Their anti-tank weapons — 2.36-inch bazookas — were woefully obsolete. When they tested their rounds against a captured T-34 tank before deploying, they discovered the rockets simply bounced off the Soviet armor. They went anyway.
On July 5, 1950, Task Force Smith took up a blocking position on a ridge south of Osan. At 7:30 a.m., a column of North Korean tanks appeared. The Americans opened fire with everything they had. The shells bounced harmlessly off the T-34s. The tanks rolled straight through the American position, barely slowing down, and continued south. The infantry came next — a six-mile-long column of 5,000 soldiers.
The Americans held for three hours. When ammunition ran out and communication broke down, Colonel Smith ordered a withdrawal. What followed was a near-rout. Soldiers abandoned weapons and equipment in the scramble to escape. Approximately 60 Americans were killed, 21 wounded, and 82 captured. Some of the wounded left behind were later found executed with gunshots to the back of the head.
Despite the defeat, Task Force Smith achieved something: it delayed the North Korean advance by about seven hours and forced the enemy to deploy and maneuver rather than simply drive south unopposed. That time, small as it was, allowed other American units to establish positions further south. The defense of South Korea would be measured in hours and days.
The Battle of Osan was a brutal revelation. American military planners had assumed that simply committing US troops would deter or quickly defeat a 'second-rate' Asian army. Task Force Smith demonstrated that North Korea's Soviet-equipped, combat-hardened forces were a serious professional military — and that America's occupation army in Japan was nowhere near ready to fight them.
The disaster prompted an immediate reckoning with American military readiness. Defense budgets had been slashed after World War II. Troops had been poorly trained and inadequately equipped. The Korean War forced a rapid buildup of American military capacity that would define the Cold War — more troops, more spending, more forward deployments. Task Force Smith, in its failure, changed the shape of the American military for a generation.