Plato, Laws 829b

οὐκ ἐν πολέμῳ τὸν πόλεμον ἑκάστοις γυμναστέον, ἀλλʼ ἐν τῷ τῆς εἰρήνης βίῳ. δεῖ τοίνυν πόλιν ἑκάστου μηνὸς νοῦν κεκτημένην στρατεύεσθαι μὴ ἔλαττον μιᾶς ἡμέρας, πλείους δέ, ὡς ἂν καὶ τοῖς ἄρχουσιν συνδοκῇ, μηδὲν χειμῶνας ἢ καύματα διευλαβουμένους, αὐτούς τε ἅμα καὶ γυναῖκας καὶ παῖδας, ὅταν ὡς πανδημίαν ἐξάγειν δόξῃ τοῖς ἄρχουσιν, τοτὲ δὲ καὶ κατὰ μέρη· καί τινας ἀεὶ παιδιὰς μηχανᾶσθαι καλὰς ἅμα θυσίαις, ὅπως ἂν γίγνωνται μάχαι τινὲς ἑορταστικαί,

not in war-time, but while they are living in peace. Therefore, a judicious State must carry out a march, every month, for not less than one whole day, or more (according as the rulers decree), paying no heed to cold weather or hot: all shall join in it—men, women and children—whenever the rulers decide to march them out en masse, and at other times they shall go in sections. Along with sacrifices, they must continually devise noble games, to serve