Blunt instruments (such as clubs, staves, maces, and hammers), pole weapons (e.g. spears and scythes), bladed weapons (like axes, knives, daggers, and sickle-swords), and ranged weapons (including javelins, throwing sticks, throwing axes, slings, bow and arrows) were all employed in war. Soldiers wore helmets composed of either copper or bronze; additionally, armor (cloaks studded in metal discs) and shields.
The first war in Sumerian recorded history was between the two city-states of Lagash and Umma (an intermittent, border war which may have lasted nearly 200 years from c. 2525 – c. 2342 BCE) as described on the Stele of the Vultures. The stele shows the king of Lagash (Eannatum r. c. 2457 – c. 2425 BCE) leading an army (consisting mainly of infantrymen). The infantrymen were primarily armed with spears, carried wooden/wicker, rectangular shields, and wore: caps (made out of leather) underneath helmets composed of either copper or one of its alloys (e.g. arsenic for arsenical bronze, or tin). Depictions of the light infantrymen show them wearing: kaunakes (short woollen mantles with tufts of feathers sown onto them and worn like unisex wraparound skirts); as well as, armor (cloaks of sheepskin on their backs studded in metal discs or plates), and no body armor protecting their torsos. The spearmen are shown arranged in what resembles the phalanx formation, which requires training and discipline; this implies that the Sumerians may have made use of professional soldiers.
The armies of the city-states could each have up to 3,600—5,400 soldiers. The organization of their armies was based on multiples of 6 (60, 120, 600, etc.) These large armies would consist of many military units. One military unit known as the nu.banda contained anywhere from 60—120 erin (conscripts, laborers, or soldiers) and may have been led by an ugula (overseer or commander). Other known units include the shublugal.
To support the main army there would be four-wheeled war wagons each with two-man crews. One crewman would be the driver and the other; a soldier (armed with a lance or battle axe). Each wagon was pulled by four Asiatic wild asses. These early wheeled vehicles functioned less effectively in combat than did the much later chariots, and some have suggested that these wagons served primarily as transports. The cabless cart was composed of a woven basket and the wheels had solid three-piece designs.
The near-constant warfare among the city-states of Sumer helped the Mesopotamians develop their military technology and techniques to a high level. Sumerian city-states were surrounded by defensive walls. The Sumerians engaged in siege warfare between their cities; but, the mudbrick walls were able to deter some foes. Soldiers would besiege cities using battering rams and sappers.