Apart from the pitched battles, the warfare of Alexander was largely hill-fighting, in which the hypaspistae took the principal part, and the contingents of light-armed hillmen from the Balkan region did excellent service.
He further made the cohort the military unit instead of the maniple, and his cavalry and light-armed troops were drawn from foreign countries, so that it may be said that Marius was the originator of the mercenary army.
In time of war they served as light-armed troops or as rowers in the fleet; from the Peloponnesian War onwards they were occasionally employed as heavy infantry (61rXZr at), distinguished bravery being rewarded by emancipation.
The only light-armed force was that of Boeotia at Delium (io,000 with 500 peltasts).
Their new stronghold, screened by mountains and forests, was unassailable by cavalry or artillery, but admirably suited to the light-armed Uskoks, whose excellence lay in guerilla warfare.