Visual Timeline: Persian Warfare
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625 BCE - 585 BCE: Median army organized during the reign of Cyaxares of the Medes.
550 BCE - 530 BCE: Achaemenid Army organized under Cyrus the Great of Persia based on Cyaxares' model.
522 BCE - 486 BCE: The Achaemenid Persian military is expanded and refined under the reign of Darius I the Great.
486 BCE - 465 BCE: Achaemenid Persian military expanded further under the reign of Xerxes I.
247 BCE - 224 CE: Under the Parthian Empire, cavalry becomes the dominant force of the military in the region.
224 CE - 240 CE: Reign of Ardashir I who founds Sassanian Empire and reorganizes the military drawing on all the models of the past and present.
224 CE - 651 CE: Under the Sassanian Empire, the Persian military becomes the greatest fighting force in the ancient world, repeatedly defeating Roman Empire.
651 CE: Sassanian Empire falls to invading Muslim Arabs; Persian army and navy are disbanded.