Of course the population of this great Persian empire was not a population of Persians, The Persians were only the small conquering minority of this enormous realm. The rest of the population was what it had been before the Persians came from time immemorial, only that Persian was the administrative language. Trade and finance were still largely Semitic, Tyre and Sidon as of old were the great Mediterranean ports and Semitic shipping plied upon the seas. But many of these Semitic merchants and business people as they went from place to place already found a sympathetic and convenient common history in the Hebrew tradition and the Hebrew scriptures. A new element which was increasing rapidly in this empire was the Greek element. The Greeks were becoming serious rivals to the Semites upon the sea, and their detached and vigorous intelligence made them useful and, unprejudiced officials. FINE PIECE OF ATHENIAN POTTERY FINE PIECE OF ATHENIAN POTTERY Showing Greek merchant vesselswith sails and oars statue on left _Brit. Mus._ It was on account of the Scythians that Darius I invaded Europe. He wanted to reach South Russia, the homeland of the Scythian horsemen. He crossed the Bosphorus with a great army and marched through Bulgaria to the Danube, crossed this by a bridge of boats and pushed far northward. His army suffered terribly. It was largely an infantry force and the mounted Scythians rode all round it, cut off its supplies, destroyed any stragglers and never came to a pitched battle. Darius was forced into an inglorious retreat. He returned himself to Susa but he left an army in Thrace and Macedonia, and Macedonia submitted to Darius. Insurrections of the Greek cities in Asia followed this failure, and the European Greeks were drawn into the contest. Darius resolved upon the subjugation of the Greeks in Europe. With the Phœnician fleet at his disposal he was able to subdue one island after another, and finally in 490 B.C. he made his main attack upon Athens. A considerable Armada sailed from the ports of Asia Minor and the eastern Mediterranean, and the expedition landed its troops at Marathon to the north of Athens. There they were met and signally defeated by the Athenians. An extraordinary thing happened at this time. The bitterest rival of Athens in Greece was Sparta, but now Athens appealed to Sparta, sending a herald, a swift runner, imploring the Spartans not to let Greeks become slaves to barbarians. This runner (the prototype of all “Marathon” runners) did over a hundred miles of broken country in less than two days. The Spartans responded promptly and generously; but when, in three days, the Spartan force reached Athens, there was nothing for it to do but to view the battlefield and the bodies of the defeated Persian soldiers. The Persian fleet had returned to Asia. So ended the first Persian attack on Greece.