The common factor of early warfare is bronze weapons:
Excavations at Mersin, Anatolia show the presence of fortifications and soldiers' quarters by 4300 BC.[25]
Excavation work undertaken in 2005 and 2006 has shown that Hamoukar was destroyed by warfare by around 3500 BC-—probably the earliest urban warfare attested so far in the archaeological record of the Near East.[26] Continued excavations in 2008 and 2010 expand on that.[27]
https://revije.ff.uni-lj.si/DocumentaPraehistorica/article/viewFile/35.6/1792