The musketeers wore no armour, at least by the end of the Civil War, although it is not certain that none had iron helmets at the beginning. They wore a bandolier from which were suspended twelve wooden containers, each with a ball and measured charge of powder for their matchlock muskets. These containers are sometimes referred to as the "Twelve Apostles". According to one source, they carried 1 lb of fine powder, for priming, to 2 lbs of lead and 2 lbs of ordinary powder, the actual charging powder, for 3 lbs of lead. They were normally deployed six ranks deep, and were supposed to keep up a constant fire by means of the "countermarch"—either by introduction whereby the rear rank filed to the front to fire a volley, or by "retroduction" where the front rank fired a volley then filed to the rear. By the time that they reached the front rank again, they should have reloaded and been prepared to fire. At close quarters, there was often no time for musketeers to reload, and they used their musket butts as clubs. They carried swords, but these were often of inferior quality, and ruined by use for cutting firewood. Bayonets were not introduced into European armies until the 1660s and so were not part of a musketeer's equipment.