evidence: North Toward the Yalu River [...] Foreign Minister Zhou Enlai of China had warned the general more than once that if UN troops approached the Yalu River, the Chinese would enter the war. MacArthur ignored Enlai’s warnings. The general simply did not believe that China would ever get involved. [...] On November 24, MacArthur launched a massive offensive toward the Chinese border. Almost on cue, hundreds of thousands of Chinese troops stormed across the Yalu River from the north, sending US and UN troops into frantic retreat. The scope of the invasion was breathtaking. Julius Becton Jr. recalled: