This warlike people of Germans had been astonished by the immense preparations of Alexander Severus; they were dismayed by the arms of his successor, a barbarian equal in valor and fierceness to themselves. But still hovering on the frontiers of the empire, they increased the general disorder that ensued after the death of Decius. They inflicted severe wounds on the rich provinces of Gaul; they were the first who removed the veil that covered the feeble majesty of Italy. A numerous body of the Alemanni penetrated across the Danube and through the Rhætian Alps into the plains of Lombardy, advanced as far as Ravenna, and displayed the victorious banners of barbarians almost in sight of Rome. The insult and the danger rekindled in the senate some sparks of their ancient virtue. Both the emperors were engaged in far distant wars, Valerian in the East, and Gallienus on the Rhine. All the hopes and resources of the Romans were in themselves. In this emergency, the senators resumed the defence of the republic, drew out the Prætorian guards, who had been left to garrison the capital, and filled up their numbers, by enlisting into the public service the stoutest and most willing of the Plebeians. The Alemanni, astonished with the sudden appearance of an army more numerous than their own, retired into Germany, laden with spoil; and their retreat was esteemed as a victory by the unwarlike Romans. When Gallienus received the intelligence that his capital was delivered from the barbarians, he was much less delighted than alarmed with the courage of the senate, since it might one day prompt them to rescue the public from domestic tyranny as well as from foreign invasion. His timid ingratitude was published to his subjects, in an edict which prohibited the senators from exercising any military employment, and even from approaching the camps of the legions. But his fears were groundless. The rich and luxurious nobles, sinking into their natural character, accepted, as a favor, this disgraceful exemption from military service; and as long as they were indulged in the enjoyment of their baths, their theatres, and their villas, they cheerfully resigned the more dangerous cares of empire to the rough hands of peasants and soldiers.