<P> A militia / mɪˈlɪʃə / is generally an army or some other fighting organization of non-professional soldiers, citizens of a nation, or subjects of a state, who can be called upon for military service during a time of need, as opposed to a professional force of regular, full - time military personnel, or historically, members of a warrior nobility class (e.g., knights or samurai). Generally unable to hold ground against regular forces, it is common for militias to be used for aiding regular troops by skirmishing, holding fortifications, or irregular warfare, instead of being used in offensive campaigns by themselves . Militia are often limited by local civilian laws to serve only in their home region, and to be serve only for a limited time; this further reduces their use in long military campaigns . </P> <P> With the emergence of professional forces (in the form of mercenaries whose livelihood was military service) during the Renaissance, Western European militias wilted; later however, they would be revived as part of Florentine civic humanism, which held that professional militaries were a result of corruption, and admired the Roman model . The civic humanist ideal of the militia was spread through Europe by the writings of Niccolò Machiavelli (According to Hörnqvist, The Prince, ch. 12 and 13, Discourses on Livy, and The Art of War .) </P>

Ordinary citizens called out to fight in an emergency were part of what was known as the