Before Verdun, German infantry division had 4 regiments, Each regiment had 12 infantry companies and 1 machine gun company. By end of war, each regiment had 6 infantry and 2 machine gun companies, plus mortar and grenade platoons, and each division had additional machine gun battalion of 18 guns, plus an Assault company. All armies had the heavy machine gun, but not light machine guns. French and British adopted light machine guns, the French used the Chauchat in late 1915, the British used the US-made Lewis gun, followed by the Germans in mid-1916 who at first used captured Madsens (only 21 lbs) from Russians, then captured British Lewis gns (25 or31 lbs), then made their own Model 08/15 light machine gun (31 or 43 lbs) that was a modified Maxim with water-cooled barrel (40 lbs plus 83 lb mount) These heavily armed companies added the grenade launcher introduced in 1917.