Which civilisation invented shield wall? How did the new tactic affect the battles?
It is difficult to say who originally developed the shield wall, but records from Mesopotamia show it has been in use since at least 3000 B.C. A shield wall is effective as it creates a military unit that is harder to push back as the pressure is spread over multiple people instead of just one individual. It created a solid wall of soldiers that could effectively fight against armies that were less organized. The tactic was used by Greek, Roman, Viking, and other armies until the arrival of gunpowder.