No such considerations, however, prevented the Carthaginians in their hour of distress from appointing Hanno general; because he had the credit of having on a former occasion reduced the city called Hecatompylos, in Libya, to obedience. They also set about collecting mercenaries; arming their own citizens who were of military age; training and drilling the city cavalry; and refitting what were left of their ships, triremes, penteconters, and the largest of the pinnaces. Meanwhile Mathōs, being joined by as many as seventy thousand Libyans, distributed these fresh troops between the two forces which were besieging Utica and Hippo Zarytus, and carried on those sieges without let or hindrance. At the same time they kept firm possession of the encampment at Tunes, and had thus shut out the Carthaginians from the whole of outer Libya. For Carthage itself stands on a projecting peninsula in a gulf, nearly surrounded by the sea and in part also by a lake. The isthmus that connects it with Libya is three miles broad: upon one side of this isthmus, in the direction of the open sea and at no great distance, stands the city of Utica, and on the other stands Tunes, upon the shore of the lake. The mercenaries occupied both these points, and having thus cut off the Carthaginians from the open country, proceeded to take measures against Utica itself. They made frequent excursions up to the town wall, sometimes by day and sometimes by night, and were continually throwing the citizens into a state of alarm and absolute panic.