A submachine gun is a firearm that fire pistol ammunition in automatic mode like a machine gun. On the other hand, an assault rifles fires a more powerful round in either semi-automatic or fully-automatic modes. Submachine guns were developed by adding stocks and automatic firing capacity to pistols.
1.4 million years ago: The knife is invented in Ethiopia. 400,000 BC: Spears made of stone are found in Germany. 100,000 BC: Axes and lithic blades are invented in Africa and Near East. 50,000 BC: The first bow is invented in Tunisia.
Since times immemorial, man has always been in search of means of protection—both from wild animals and from human enemies. This is the reason for his quest for weapons. The first weapons that man invented were nothing more than simple stones and sticks that could be hurled at the potential enemy.