The general's main task is to command the naval fleet and the Athenian army. At first, the general only commanded the troops of his tribe. However, with the change of the battlefield environment, this situation of being only responsible for one's own tribe seems out of place, especially with the transformation of Athens from a city-state to an empire, generals need greater autonomy to perform their duties on overseas battlefields. However, even if the general has great power, that is, as a minority official of the city-state, even if the general can be re-elected, in any case, the general must obey the decision of the parliament. According to Aristotle's Athens political system, one of the generals was responsible for defending the land territory of the city-state, another compiled a list of captains of warships, and two generals were responsible for defending the port of Piraeus.