Qin defeated Lian Po, the general of Zhao, and after the defeat, Lian Po adopted the strategy of sticking to it. Qin Jun breached several camps in Lian Po, and the prince of Zhao was very scared when he heard the news. He sent Zhao Kuo instead of Lian Po and transferred all Zhao's troops to Changping front. The state of Qin recruited soldiers and sent experts to take up the post of commander in chief. After the emergency mobilization of Qin and Zhao, more than 600,000 troops of Qin and 450,000 troops of Zhao all gathered in Changping. Because of the relatively small population in ancient times, the scale of the battle of Changping at that time was no less than the war in which tens of millions of people participated in modern times.
The result of the battle of Changping was also very tragic. The Qin and Zhao armies fought for a long time, and finally Qin Jun cut off Zhao's supplies of food and grass. Finally, Zhao Kuo and Zhao led the death squads to death without food and died in chaos. The remaining troops of Zhao surrendered to Qin Jun. Qin Jun killed all the captured Zhao troops. In the battle of Changping, Zhao lost 450,000 people and Qin lost more than half of its military forces. The death toll in this battle is more than some meat grinder battles in later generations.
In addition to the battle of Changping, the battles of Stalingrad and Leningrad in modern war history are also very tragic battles. These two battles lasted for a long time, with millions of casualties, far more tragic than the great battles during World War I. Apart from these two battles, most of the operations on the Pacific islands were also very tragic. Although the casualties of both sides in the Pacific island operations were not as good as those in the European battlefield, the process of the Pacific island operations was very tragic because the Japanese army did not surrender.