Aeneas the Tactician, On the Defence of Fortified Positions
10.9-10 (tr. Illinois Greek Club):
Strangers arriving shall carry their weapons unconcealed and ready at hand, and immediately upon arrival shall be disarmed, while no one, not even the innkeepers, shall receive them without permission from the authorities, who shall record also in whose house any persons are, when they take lodging; and at night inns must be locked from the outside by the authorities. From time to time vagrants among these strangers shall be publicly expelled. Citizens of neighbouring states, however, residing in the city for the sake of education or for some other special purpose, shall be registered.
Frequent calls to arms shall be given and all strangers in the town shall at this time assemble in a specified place or remain indoors; if, however, one of them shall appear elsewhere, a penalty shall be prescribed for him as a malefactor. At a given signal their stores and shops shall be closed and their lights extinguished, and no one else shall come in. Whenever it is necessary for anyone, he may go out with a lantern, until orders are issued to the contrary. For whoever points out anyone conspiring against the city, or reports anyone as doing any of the things above-mentioned, a reward in money shall be announced, and the reward shall be displayed openly in the market-place or on an altar or in a temple, in order that men may the more readily venture to report any violation of the provisions mentioned.