to the city. When they did, they fought as well-armoured heavy infantry armed with long thrusting spears, although they were notoriously ill-trained and ill-disciplined. In most circumstances Carthage recruited foreigners to make up its army. Many were from North Africa and these were frequently referred to as "Libyans". The region provided several types of fighters, including: close-order infantry equipped with large shields, helmets, short swords and long thrusting spears; javelin-armed light infantry skirmishers; close-order shock cavalry (also known as "heavy cavalry") carrying spears; and light cavalry skirmishers who threw javelins from a distance and avoided close combat. (The latter cavalry were usually Numidians.) The close-order Libyan infantry and the citizen-militia would fight in a tightly packed formation known as a phalanx. On occasion some of the infantry would wear captured Roman armour, especially among Hannibal's troops. In addition both Iberia and Gaul provided large numbers of experienced infantry and cavalry. These infantry were unarmoured troops who would charge ferociously, but had a reputation for breaking off if a combat was protracted. The Gallic cavalry, and possibly some of the Iberians, wore armour and fought as close-order troops; most or all of the mounted Iberians were light cavalry. Slingers were frequently recruited from the Balearic Islands. The Carthaginians also employed war elephants; North Africa had indigenous African forest elephants at the time. Garrison duty and land blockades were the most common operations. When armies were campaigning, surprise attacks, ambushes and stratagems were common. More formal battles were usually preceded by the two armies camping apart for days or weeks; sometimes forming up in battle order each day. If either commander felt at a disadvantage, they might march off without engaging. In such circumstances it was difficult to force a battle if the other commander was unwilling to fight. Forming up in battle order was a complicated and premeditated affair, which took several hours. Infantry were usually positioned in the centre of the battle line, with light infantry skirmishers to their front and cavalry on each flank. Many battles were decided when one side's infantry force was attacked in the flank or rear and they were partially or wholly enveloped. Both states possessed large fleets throughout the war. The Carthaginian fleet rarely put to sea, and when it did it was usually to escort transport ships; it rarely acted aggressively. This gave the Romans naval superiority for the duration of the war.