The regular army is the regular army. It is the main armed force for defense and offense. It is often called the mighty division, the elite division, and the tiger and wolf division against the enemy.

The guerrillas are a part of the irregular armed forces. They are auxiliary armed forces that cooperate with the regular forces in defense and operations. They are often regarded as a ragtag group and are generally considered to have little combat effectiveness. However, in World War II, the guerrillas led by the Communist Party of China and the guerrillas led by the Communist Party of Yugoslavia both achieved outstanding results. The Communist Party of China and the Eighth Route Army, New Fourth Army guerrillas and local armed forces led by the Communist Party of China have unprecedented performance in the theory and practice of guerrilla warfare. Since 1941, they have resisted more than 60% of the invaders who invaded China. Japanese army. Before that, the Japanese invaders mainly fought against the Kuomintang regular army. After 1941, they gradually closed the frontal front and used their main force to deal with the Communist guerrillas. The Yugoslav guerrillas independently wiped out more than 400,000 German troops, which was the largest number of German troops wiped out in the European battlefield except the Soviet Union, Britain and the United States.