Tell me what the Roman Army didn't know and don't cover it with 'pseudo-scientific', jargon.<p>Though the exact numbers of men in a legion varied, the basic pattern of organization remained the same. The smallest unit was the tent group (contubernium), composed of 8 men who shared a tent, a mule, and eating equipment. These were organized into a disciplinary unit called a century (despite the fact that a century typically had 80 rather than 100 men), under the command of a centurion. The basic fighting unit was a cohort, composed of six centuries (480 men plus 6 centurions). The legion itself was composed of ten cohorts, and the first cohort had many extra men—the clerks, engineers, and other specialists who did not usually fight—and the senior centurion of the legion, the primipilus, or “number one javelin.”