 Complete the following phrase:  With all his good qualities, Frederick was not a man to recognize fully his own limitations and that of his country. But he rightly regarded the accession of Charles X of Sweden on 6 June 1654 as a source of danger to Denmark. He felt that temperament and policy would combine to make Charles an aggressive warrior-king: the only uncertainty was in which direction he would turn his arms first. Charless invasion of Poland in July 1655 came as a distinct relief to Frederick, even though the 