The Battle of the Samichon River (24–26 July 1953) was fought during the final days of the Korean War between United Nations (UN) forces—primarily Australian and American—and the Chinese People's Volunteer Army (PVA). The fighting took place on a key position on the Jamestown Line known as "the Hook", and resulted in the defending UN troops, including the 2nd Battalion, Royal Australian Regiment (2 RAR) from the 28th British Commonwealth Brigade and the US 7th Marine Regiment, repulsing numerous assaults by the PVA 137th Division during two concerted night attacks, inflicting numerous casualties on the PVA with heavy artillery and small-arms fire. The action was part of a larger, division-sized PVA attack against the US 1st Marine Division, with diversionary assaults mounted against the Australians. With the peace talks in Panmunjom reaching a conclusion, the Chinese had been eager to gain a last-minute victory over the UN forces, and the battle was the last of the war before the official signing of the Korean armistice.
During the action, the PVA had attempted to make a breakthrough to the Imjin River along the divisional boundary between the US 1st Marine Division and the 1st Commonwealth Division to turn the Marine division's flank. Yet with well-coordinated indirect fire from the divisional artillery, including the 16th Field Regiment, Royal New Zealand Artillery, and support from British Centurion tanks of the 1st Royal Tank Regiment, 2 RAR successfully thwarted both assaults, holding the Hook. U.N sources estimated PVA casualties at 2,000 to 3,000 killed, with the majority of them inflicted by the New Zealand gunners. Meanwhile, on the left flank, US Marines had endured the brunt of the attack, repelling the PVA onslaught with infantry and artillery. Only a few hours later, the armistice agreement was signed, ultimately ending the war. Both sides subsequently withdrew within 72 hours to create the Korean Demilitarised Zone.
Background
Military situation
Following the Battle of Maryang San in early October 1951 the 28th British Commonwealth Brigade maintained a defensive posture for the rest of the month. Amid heavy fighting on the afternoon of 4 November the PVA recaptured Hill 317, which was by then held by the 1st Battalion, King's Own Scottish Borderers, in an action for which Private Bill Speakman was later awarded the Victoria Cross. The hill remained in PVA hands until the end of the war. The Battle of Maryang San subsequently proved to be one of the last UN actions in the war of manoeuvre, and with peace talks going on, the fighting was replaced by a static war characterised by fixed defences, trench lines, bunkers, patrols, wiring parties, and minefields reminiscent of the Western Front in 1915–17. Construction of defensive localities sited in all-round defence with interlocking arcs of fire began almost immediately, although such operations were confined to the reverse slopes during the day due to artillery and mortar fire, which made such operations hazardous. Patrolling and ambushing by both sides also began to prevent the other from gaining control of no man's land. The 1st Commonwealth Division, which included British, Australian, Canadian, New Zealand, and Indian troops, subsequently occupied part of the Jamestown Line—a UN defensive position that extended across central Korea—in the US I Corps sector on the US Eighth Army's left flank. The war was no less bloody, though, and the division remained in the line for all but two of the remaining 19 months of the war.