Jamieson, Fausset and Brown on 2 Chronicles 26:11-15

11-15. an host of fighting men, that went out to war by bands--He raised a strong body of militia, divided into companies or regiments of uniform size, which served in rotation. The enumeration was performed by two functionaries expert in the drawing up of military muster-rolls, under the superintendence of Hananiah, one of the high officers of the crown. The army consisted of 307,500 picked men, under the command of two thousand gallant officers, chiefs or heads of fathers' houses, so that each father's house formed a distinct band. They were fully equipped with every kind of military accoutrements, from brazen helmets, a habergeon or coat of mail, to a sling for stones.