
1) Roman encampment
Found on
https://www.crosswordclues.com/clue/castra

The Latin word castra, with its singular castrum, was used by the ancient Romans to mean buildings or plots of land reserved for or constructed for use as a military defensive position. The word appears in both Oscan and Umbrian (dialects of Italic) as well as in Latin. In classical Latin the word castra means `great legionary encampment` and in.....
Found on
http://en.wikipedia.org/wiki/Castra

Camp.
Found on
http://www.encyclo.co.uk/local/20764

A camp. Various forms include: - castra aestiva - a summer campaigning camp. - castra hiberna - a winter base. - castra movere - the order to break camp. - castra nova - a new camp. The second base for the Imperial Horseguard at Rome after the unit was increased in size. - castra peregrina - a military base at Rome for personnel seconded from the p…...
Found on
http://www.encyclo.co.uk/visitor-contributions.php

(Latin) fortified Roman camp; barracks in a Roman fort; the centurio had his own room while a soldier shared a room with seven others.
Found on
https://www.encyclo.co.uk/local/10135
No exact match found.