Ancient warfare
No clear line can be drawn between ancient and medieval warfare . The characteristic properties of medieval warfare , notably heavy cavalry and siege engines such as the trebuchet were first introduced in Late Antiquity . The main division within the ancient period is at the beginning Iron Age with the introduction of cavalry ( resulting in the decline of chariot warfare ) , of naval warfare ( Sea Peoples ) , and the development of an industry based on ferrous metallurgy which allowed for the mass production of metal weapons and thus the equipment of large standing armies . 
<triplet> trebuchet <subj> siege engines <obj> instance of