Cohorts is a wargame system for land battles in Imperial Rome in 6mm to 20mm scales. The basic fighting unit is a Century (Rome) and a Unit (Gauls, Germans and Britons). These are grouped into Cohorts and Bands. Turns are performed by alternate activation. Basic unit types are infantry, cavalry, artillery (Scorpion), and special units (Nobles, Skirmishers, Chariots, Fanatics).
The objective is to provide an easy, agile and adaptable rules system for the simulation of combat in the historical period between 200BC and 200AD, especially the period of Roman conquests over central Europe and Brittany. The main temporal focus is the Gallic Wars.
The definitions of a range of weapons were based on historical sources and serious publications. Likewise, the rules for combat formations and the historical characteristics of each army were also the target of research in specialized bibliography on the subject.