They fought against the Alemanni under the Caesar Julian in the Battle of Strasbourg (357). They were deployed in the middle of the second line of the Roman formation, with three auxilia palatina units on their left and other three, among which Regii and Batavi, on their right. During the battle, the Roman first line broke under the pressure of the Alamannic infantry, which pushed on the Primani. The soldiers resisted and counter-attacked, causing the enemy to flee.