Han Xin knew that he could not let Xiang Yu return to the capital. Han Xin ordered his forces to increase the number of ambushes in order to force the Chu troops into a canyon area near Gaixia, where Xiang Yu could not move at will. As the ambushes increased, Xiang Yu became more and more certain that the main traps would await him inside the canyon. Although his troops were constantly ambushed, he insisted that his troops head straight back to the capital city through the main road as fast as they could, avoiding the side paths through the canyon.