Chariots were originally invented in Mesopotamia and were initially drawn not by horse, but rather donkeys, mules, oxen and even goats. The early usage of chariots was mainly for transportation purposes. With technological improvements to their structure (such as a “cross-bar” form of wheel construction to reduce the vehicle's weight), the use of chariots for military purposes began. The Egyptians invented the yoke saddle for their chariot horses around 1500 BC. Chariots were effective for their high speed, mobility and strength which could not be matched by infantry at the time. They quickly became a powerful new weapon across the ancient Near East. The best preserved examples of Egyptian chariots are the four specimens from the tomb of Tutankhamun.