Epic Battles - ACW Union BrigadeThe most basic infantry building block was the infantry regiment (referred to as a battalion in Hardees drill manual, which was used by both sides). In both North and South the infantry regiments were organised on similar lines. A regiment typically comprised ten companies, each numbering 100 men, supported by staff, drummers and officers. However, the rigours of warfare would summarily lead to a reduction in strength by way of battle, disease and