evidence: The Inchon landing turned out to be a brilliant flanking attack. U.N. forces quickly retook Seoul and severed the North Koreans’ supply lines. Walton Walker’s Eighth Army broke out of the Pusan Perimeter and formed up with other allied units. By early October, American forces had pushed across the 38th parallel and taken the North Korean capital, Pyongyang. Before October was out, U.N. forces had advanced to the Yalu River. The war, most observers believed, would be won by Christmas. [...] Despite the labyrinthine process of obtaining U.N. approval for every change in targeting, the original constraints on the B-29s began to drop away. At first, the medium bombers were not allowed to hit targets within 50 miles of the Yalu River, and were forbidden to cross the line into Manchuria. The 50-mile limit soon dropped to 20 miles, then several, then "as close to the border as may be necessary." By the end of October, U.N. forces occupied all of North Korea. Still, Chinese territory stayed off limits. [...] On July 30, Police Action joined 62 other B-29s for an attack on the Oriental Light Metals Company near Sinuiju, only four miles from the Yalu River. According to Futrell, it was the largest strike against a single target of the Korean War. The target was deep in MiG territory, but a thin stratus layer protected the bombers from the searchlights.