X. The Senate, on receiving this news, angrily bade the consuls keep quiet, and they appointed Crassus to the command of the war, whose reputation and popularity induced many of the nobles to serve under him.  Crassus took his station on the frontiers of Picenum, with the view of waiting for Spartacus, who was moving in that direction; and he sent Mummius, his legatus, at the head of two legions, to make a circuit, and with orders to follow the enemy, but not to engage with them, nor come to close quarters.  But Mummius, as soon as he got what he thought a favourable opportunity, fought a battle, and was defeated; many of his men fell, and many, flying without their arms, made their escape.  Crassus received Mummius himself roughly, and arming the soldiers again, he required of them security for their arms, that they would keep them; and five hundred, who had been the first to run, and had shown most cowardice, he distributed into fifty decades,[33] and out of each decade he took one man, by lot, and put him to death; thus inflicting on the soldiers this ancient mode of punishment which had long fallen into disuse; for disgrace also is added to the manner of death, and many things horrible and dreadful to see accompany the punishment, in the presence of all the spectators.  After inflicting this punishment, he made his men again face about and march against the enemy.  Spartacus, however, avoided Crassus, and made his way through Lucania to the sea, and, falling in with some Cilician piratical vessels, in the Straits, he formed a design to seize Sicily, and by throwing two thousand men into the island, to kindle again the servile war there, the flames of which had not long since been quenched, and required only a few sparks to set it again in a blaze.  The Cilicians[34] came to terms with Spartacus, and received his presents; but they deceived him, and sailed off.  Under these circumstances, he marched back from the coast, and fixed his army in the peninsula of the Rhegine territory.  Crassus now came up, and observing that the nature of the ground suggested what was to be done, he resolved to build a wall across the isthmus, for the purpose of keeping his soldiers employed, and cutting off the supplies of the enemy.  Though the undertaking was great and difficult, he accomplished it, and completed the work, contrary to all expectation, in a short time, by digging a ditch[35] from sea to sea, through the neck of land, three hundred stadia in length, fifteen feet deep, and as many wide; and above the ditch he raised a rampart of surprising height and strength.  At first Spartacus paid no attention to what was going on, and treated it with contempt; but when forage began to fail, and he wanted to advance further into the interior, he discovered the lines of Crassus; and as there was nothing to be got in the peninsula, taking advantage of a night when there was a fall of snow and a wintry storm, he filled up a small part of the ditch with earth, and wood, and the branches of trees, and so carried over a third part of his army.