In "Operation Kogo", 390,000 Chinese soldiers, led by General Tang Enbo, defended Luoyang. The Japanese 3rd Tank Division crossed the Yellow River around Zhengzhou in late April and defeated the Chinese near Xuchang. They then moved around to the right and put Luoyang under siege. Luoyang was defended by three Chinese divisions. The 3rd Tank Division began to attack on May 13 and won Luoyang on May 25.