Fighting a battle in an ancient world demanded a special set of skills, not only the early types of technology. Very often, the ancient literature talks about “glorious heroes” who destroyed the enemy on land or on the sea. These ancient wars weren’t only conflicts. They were a sort of communication, psychological fight over who is more superior. So, in the case of Greek Fire and flamethrowers, we can also see hidden propaganda that aimed to weaken the enemy.
Blowgun, meteor hammer, dagger-axe… Check some of the most interesting examples of ancient weapons.
Ancient, Medieval, and early modern people saw war as a means to an end. In general, they saw war as something they have to do to obtain something else, because there is no other, better option.