Havercamp and others have "simul ac belli patiens erat, in castris per laborem usu militiam discebat;" but per laborem usu is assuredly not the hand of Sallust.
Sed illud maximum: octo hominum milia tenebat Hannibal, non quos in acie cepisset, aut qui periculo mortis diffugissent, sed qui relicti in castris fuissent a Paulo et a Varrone consulibus.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "castris" in a variety of sentences. We hope that you will now be able to make sentences using this word.
