http://agathe.gr/democracy/the_athenian_army.html
The Athenian Army From the very beginning, the Athenians were compelled to fight for their new democracy. Their dramatic victories over the Boiotians and Chalkidians in 506 B.C. led many to attribute Athenian ... The Roundabout Painter was named for this vase, which shows three warriors and a trumpeter running around the body of the jug. ... Citizens received military training during their service as ephebes from age 18 to 20: The people elect two athletic trainers and instructors for them, to teach them their drill as heavy-armed soldiers and to use the bow, javelin, and sling ... They go on in this mode of life for the first year; in the following year an assembly is held in the theater, and the ephebes give a display of drill before the people and receive a shield and spear from the state and they then serve on patrols in the country and are quartered at the guard-posts.