Accordingly, Darius collected an immense army himself, and advanced to meet the Macedonians in person. Nothing could exceed the pomp and magnificence of his preparations. There were immense numbers of troops, and they were of all nations. There were even a great many Greeks among his forces, many of them enlisted from the Greeks of Asia Minor. There were some from Greece itself--mercenaries, as they were called; that is, soldiers who fought for pay, and who were willing to enter into any service which would pay them best.