 Triangular divisions were smaller, allowing for more divisions to be formed, and were considered more suited for the positional warfare which characterized World War I.A square division typically advanced with two brigades in line or with the brigades echeloned (one ahead of the other), with one regiment forward and one in reserve ready to engage when the first regiment came into contact with the enemy.In positional warfare, the regiments were formed in line to cover as much of a sector as possible, and typically formed their own reserves, with one or two battalions forward and the rest in reserve.