One particularly morbid example I have stumbled upon early in my life, when I had just begun delving into Chinese and military history, was the Battle of Changping (長平).

Qin commander Bai Qi eventually defeated his younger, brave, but painfully underexperienced opponent Zhao Kuo, which took more than two months (the entire battle, counting the very first skirmishes, lasted almost two years and a half). To achieve this, he employed a maneuver strikingly resembling what had become later known as "Cannae movement" in the West due to Hannibal Barca's victory over Romans, then firmly trapped Zhao's army in the valley they couldn't have broken out in a decisive manner, because of lack of forage for horses and other supplies. Over 400,000 Zhao soldiers were captured. After the battle, Bai Qi failed to deliver on his promises to them and ordered to bury prisoners alive, with a sole exception of 240 youngest soldiers, who were spared and released back to Zhao to spread terror among the population of the kingdom.

Even today, some remains of ancient bones are sometimes found near Gaoping, as Changping is currently known,

and locals prepare Tofu of variety called 白起豆腐, that is, "Bai Qi meat," symbolically representing atrocities of Qin commander unleashed upon their ancient ancestors.