There was rarely any lack of work for the swords of Rome. While Marius was absent in Africa a frightful peril threatened the Roman state. A vast horde of barbarians was sweeping downward from the north. The Germans of Central Europe had ravaged Switzerland and invaded Gaul. Every army sent against them had been defeated with great slaughter. Italy was in immediate danger of invasion, Rome in imminent peril. Marius was sadly needed, and on his return from Africa was hailed as the only man who could save the state. Instantly he gathered an army and set out for Gaul, Sulla going with him as a subordinate officer. Two years were spent in marches and counter-marches, and then (B.C. 102) he met the enemy and defeated them with immense slaughter. Reserving the richest of the spoils, he devoted the remainder to the gods, and, as he stood in a purple robe, torch in hand, about to apply the flame to the costly funeral pile, horsemen dashed at full speed through the open lines of the troops, and announced that for a fifth time he had been elected consul of Rome. In this war Sulla also showed valor and won fame. But he had grown jealous of the glory of Marius, and left his army to join that of the consul Catulus, who was being driven backward by another great horde of barbarians. Marius, having beaten his own foes, hastened to the relief of his associate; the flight was stopped, and a battle ensued in which the invading army was swept from the face of the earth, and Rome freed for centuries from danger of barbarian invasion. Sulla and Catulus had their share in this victory, but the people gave Marius the whole honor, called him the third founder of their city (as Camillus had been the second), and gathered in rejoicing multitudes to witness his triumph. While this war was going on there was dreadful work at home. The slaves had, for the second time, broken into insurrection. This servile war was mainly in Sicily, where thousands of slaves were slain. Of the captives, many were taken to Rome to fight with wild beasts in the arena, but they disappointed the eager spectators by killing each other. This outbreak only made slavery at Rome harder and harsher than before. Years passed on, and then another war broke out. The Italian allies, who had helped to make Rome great, claimed rights of citizenship and suffrage. These were denied, and what is known as the Social War began. Sulla and Marius took part in this conflict, which ended in favor of Rome, though the franchise fought for was in large measure gained. It was of little value, however, since all who held it were obliged to go to the city of Rome to vote. During these various conflicts the rivalry between Marius and Sulla grew steadily more declared. The old plebeian, now seventy years of age, was jealous of the honors which his aristocratic rival had gained in the Social War, and a spirit of bitter hatred, which was to bear dire results, arose in his heart.