How did marius change the roman army?

Marius professionalized the army. He opened it up to all citizens, not just those who could afford to arm themselves. He gave the army a sense of unity. He introduced the cohort system of fighting...

Sulla did not change the Roman army, it was his enemy, and one time friend, Marius who made the innovations to the army.

Before Marius, the army was only open to members of the high census class and a man had to own property worth 3500 sesteres in value, plus he had to supply his own weapons.Marius opened up the army...

well he changed it by building stronger armies and helping after the fall of rome..... he was a great effect on the roman lives.

Paid volonteers enlisted for terms up to 20 years.