 Early cavalry were employed as shock troops, needed to punch holes into the enemy lines to allow infantry to penetrate them, isolate pockets and eliminate them.They were also used to harass enemy flanks, and sometimes outflank enemies, and most armies trembled at the sight of a chariot force.As infantry, the Sumerians used a heavy infantry phalanx, depicted on the Stele of the Vultures, which commemorates the victory over Umma by Lagash in 2525 BCE.