The Liber de munitionibus castrorum ("Book about the fortifications of a camp", as it is usually known) describes how to lay out a temporary camp for a Roman army on campaign, comprising three legions and associated troops of various types. It is our main source for many aspects of Roman military studies, as it includes descriptions of not only the major military unit types, but also the different methods of fortification. Only a single copy of the work survives, preserved in a sixth-century manuscript, and the Latin text is in poor condition requiring major emendation. Although German, French, and Italian editions have appeared at various times, this is the first English-language edition, in which a new Latin text is presented alongside a facing-page translation. An apparatus criticus indicates the source of all emendations utilized in the new text, and the volume is rounded off with a full bilingual index.