Camouflage became an essential part of moern military tactics after the increase in accuracy and rate of fire of weapons during the 19th century. Despite camouflage's demonstrated value, until the 20th century, armies tended to use bright colours and bold, impressive designs. These were intended to daunt the enemy, foster unit cohesion, allow easier identification of units in the fog of war, and attract recruits. Not until these uniforms covered the bodies of men in long windrows across the battlefield was there a clear pressure for change.