The Roman soldiers always made sure that they were protected by fortifications. This also applied when they only stopped for a night on campaigns. In the evening of their arrival the field camp had to be set up and destroyed again on the morning of departure. The plural castra was the name given to any kind of military camp, the singular castrum certainly existed but was not used in mil. vocabulary. Castellum is the diminutive form of castra (Veg. Mil. 3,8) and also had a civilian meaning.
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Le Bohec, Yann (Lyon),
Förtsch, Reinhard (Cologne),
Šašel Kos, Marjeta (Ljubljana),
Lombardo, Mario (Lecce),
Todd, Malcolm (Exeter) and
Burian, Jan (Prague),
Brill’s New Pauly, Antiquity volumes edited by: Hubert Cancik and , Helmuth Schneider, English Edition by: Christine F. Salazar, Classical Tradition volumes edited by: Manfred Landfester, English Edition by: Francis G. Gentry.
Consulted online on 16 July 2019 <http://dx.doi.org/10.1163/1574-9347_bnp_e228750>