He was responsible for a lot of military reforms

Gaius Marius has garnered a lot of praise for his creative approach to the military during his long career as an army commander. During the war in Africa with Jugurtha, Gaius Marius made one of the army's most noteworthy innovations. During this time, Marius let Romans from all social classes including the lower classes enlist. This was regarded as a great honor for persons from less fortunate families and it significantly expanded the number of his army. Despite initial public criticism, the Roman army eventually adopted this maneuver as a normal procedure.

Marius revised his men's logistics and training during his subsequent consular visits. Marius ordered his soldiers to carry all of their supplies, guns, blankets, and clothing rather than using baggage trains. Due to this, ancient Roman troops were known as Marius' mules.

He also enhanced the pilot, a javelin that, after being enhanced, will bend to the point of becoming useless when hurled at foes. Although Marius is credited with many innovations during this time, there is no proof to back up the assertion that he was the one who altered the army's tactical unit from madman to cohort.