Why is the football World Cup understood as a war?

In peacetime, football, as a formal game with the largest number of participants, can reflect the comprehensive quality of a country and people in terms of physical fitness, tactical thinking, team cooperation ability, physical coordination ability, psychological willpower and physical strength. Many countries even regard football as a national representative, so the World Cup is a very important performance platform for participating countries. Not only inside and outside the stadium, but also the mental state shown by the whole organization and fans. Every country struggles in the World Cup, just like a war without smoke. The team with the strongest performance and the best performance will win the final victory.