1567- 1085 -- The pharaoh Ahmose I defeated and expelled the Hyksos from Egypt, reuniting the kingdom to end the age of chaos. This established the eighteenth dynasty and a period of Egyptian civilization historians refer to as "The New Kingdom." This period of Egyptian civilization was marked by improvements in warfare and the maintenance of state. During this period Viziers, who were primarily responsible for the maintenance of state, were selected exclusively from military commanders. Egypt's military strength contributed to its becoming one of the most powerful states in the region.