Korean War two years of fighting became a war of attrition, with the front line close to the 38th parallel. The war in the air, however, was never a stalemate. North Korea was subject to a massive bombing campaign. Jet fighters confronted each other in air-to-air combat for the first time in history, and Soviet pilots covertly flew in defense of their communist allies. The fighting ended on 27 July 1953, when an armistice was signed. The agreement created the Korean Demilitarized Zone to separate North and South Korea, and allowed the return of prisoners. However, no peace treaty was ever signed,
Australia in the Korean War 1st Commonwealth Division and the 1st South Korean Division) seized the Jamestown Line destroying elements of the 42nd Army, 47th Army, 64th Army and 65th Army, and after five days of intense combat, eventually forcing the Chinese into retreat. The operation was a success, and ended on 15 October, with a few hills south of the line still in Communist hands, requiring a follow-up operation (Operation Polecharge). The official historian for the Korean War, Robert O'Neill, wrote of this battle: "In this action 3RAR had won one of the most impressive victories achieved by any Australian battalion. In five days