When Cyrus learned that his elder brother, the Great King, was approaching with his army, he drew up his army in battle array. He placed the Greek mercenaries on the right, near the river. In addition to this they were supported on their right by some cavalry, 1,000 strong, as was the tradition of battle order in that day. To the Greeks, this was the place of honor. Cyrus himself with 600 body guards was in the center, to the left of the Greek mercenaries—the place where Persian monarchs traditionally placed themselves in the order of battle. Cyrus' Asiatic troops were on the left flank.