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A SHORT HISTORY OF ENGLAND against Spain. But on the whole we shall be right if we see the first throes of the modern international problems in what is called the Thirty Years' War; whether we call it the revolt of half-heathens against the Holy Roman Empire, or whether we call it the coming of new sciences, new philosophies, and new ethics from the north. Sweden took a hand in the struggle, and sent a military hero to the help of the newer Germany. But the sort of military heroism everywhere exhibited offered a strange combination of more and more complex strategic science with the most naked and cannibal cruelty. Other forces besides Sweden found a career in the carnage. Far away to the north-east, in a sterile land of fens, a small ambitious family of money-lenders who had become squires, vigilant, thrifty, thoroughly selfish, rather thinly adopted the theories of Luther, and began to lend their almost savage hinds as soldiers on the Protestant side. They were well paid for it by step after step of promotion; but at this time their principality was only the old Mark of Brandenburg. Their own name was Hohenzollern. 162