Following their unification, Belinus and Brennius merged their armies into one great one and invaded Gaul. After a year of warfare, the joint army managed to subject all the Frankish kingdoms in Gaul to their authority. Now with an even greater army, Belinus lead his great army to Italy and threatened to invade Rome. Outside Rome, the two consuls, Gabias and Porsenna, sued for peace and offered wealth, tribute, and hostages as a sign of their submission. Belinus and Brennius accepted and took their great army to Germany. Soon after this movement north, Rome broke the treaty and marched north, and Brennius went to fight the Romans while Belinus remained at war with the Germans (who were being helped by various other Italian troops).