Why is football called war in peacetime?

Football is the closest game to war. In other words, football has many attributes of war, while other sports competitions are relatively poor.

For example, by chance, football is the easiest to get upset; By hook or by crook, there is almost no fair competition in football. As long as it's good for you, you can use any trick, cheat, cheat, cheat. Other sports are much less unpopular, and they are also very concerned about face and are not willing to cheat. Of all these, football is the closest to war.