Combat rifles have been in use since at least WWI. The only difference between combat (battle) rifles in WWI and the following wars is that most WWI rifles were bolt-action. These rifles had to be manually chambered by using the bolt-action.
The combat, battle or assault rifle's power and long-range accuracy are intended to engage targets at long distances. The Mondragón rifle was considered the first battle rifle and was patented in 1887. Researchers concluded that most engagements usually happened at shorter distances therefore it was found that rifles needed to be lighter and more compact.
This need is said to be what caused the development of the world's first true assault rifle, the German StG 44. This list contains combat (battle) and assault rifles. All the rifles on this list have been tried and tested in the heat of various battles around the world.