In the reign of the emperor Caracalla, an innumerable swarm of Suevi appeared on the banks of the Main, and in the neighbourhood of the Roman provinces, in quest either of food, of plunder, or of glory. The hasty army of volunteers gradually coalesced into a great and permanent nation, and, as it was composed from so many different tribes, assumed the name of Alemanni, or Allmen, to denote at once their various lineage and their common bravery.31 The latter was soon felt by the Romans in many a hostile inroad. The Alemanni fought chiefly on horseback; but their cavalry was rendered still more formidable by a mixture of light infantry selected from the bravest and most active of the youth, whom frequent exercise had enured to accompany the horsemen in the longest march, the most rapid charge, or the most precipitate retreat.32