In Asia, the Chinese Army used more than 20,000 mules in their battles against the Japanese.
The terrain encountered in the war in Korea during that war, resembled that of the mountains of Italy during WW II, therefore the Army employed mules for use where trucks and jeeps could not reach. Since the Chinese and North Koreans used mules for transportation, it was only a matter of time before the allied forces began to capture many animals.

Mules were used with great effectiveness by Merrill’s Marauders in the jungles of Burma. Once, following a 300-mile forced march, Merrill’s troops were confronted by an overwhelming enemy force. The mules made such a commotion that the enemy thought they must be outnumbered and withdrew.

By the start of World War II the U.S. Army had become more mechanized, horses had lost their ranking as a mode of transportation, but the mule continued to be of great value - - because of the superior ability to negotiate areas inaccessible to tanks and other vehicles, such as the mountains of Italy and the jungles of Burma. Mobilization actually began in 1930, with an authorization for 3,500 mules. By 1944 and 1945, some 14,000 mules were used by the 10th Mountain Division in northern Italy.

Imam Ali (PBUH) said: Surely, it is the common people of the community who are the pillars of the religion, the power of the Muslims and the defense against the enemies. Your leaning should therefore be towards them and your inclination with them.

Also in World War I, the British Army purchased a large number of mules from America, as the mule was able to endure the terrible conditions on the front lines and their stamina was much greater than the horse. By the end of the War, the British army owned 213,000 mules.

Imam al-Sadiq (PBUH) said: These four characteristics are from the manners of Prophets (PBUT): righteousness, graciousness, patience and perseverance in tolerating misfortunes, and rising for the right of a believer.

Imam Ali (PBUH) said: May Allah have mercy upon the person who services a right and removes a wrong, or refutes an injustice and establishes justice.

Imam al-Kadhim (PBUH) said: Among your most compulsory duties towards your Muslim brother is that you conceal nothing from him which profits him either in this life or in the Hereafter.

World War I is said to be the last major war in which the U.S. Army used mules in any significant numbers. Mules were used for hauling wagons which weighed 2,000 pounds and loaded with 3,000 pounds of cargo (including feed for the mules). Each wagon was pulled by six mules. In mountainous country, however, the wagons were useless, so a train of 50 or more mules, each carrying 250 pounds, would move in single file and cover 60 miles a day.

In both World Wars, mules were called to active duty, though to a lesser extent in World War II. Mules were better adapted to dense jungle trails and steep mountainous terrains that were inaccessible to motorized vehicles. They carried food, supplies and ammunition into the battle zones, and often carried wounded soldiers out. Some 8,000 mules were killed in those wars, and supply ships carrying mules were prized targets for enemy submarines. because they were needed supplies and transport.