To all appearance, therefore, the Dutch had now stiffened their backs and were prepared to fight for their liberty to fish on the British coasts, as they had done at Spitzbergen, instead of sending commissioners to London to haggle over it. But their uncompromising attitude was soon modified owing to certain political events, which taught them the need of caution in flouting the wishes of the King of England. In the autumn of 1619, Frederick, the Elector Palatine, who had married Elizabeth, the daughter of James, was offered and accepted the crown of Bohemia under circumstances pregnant with troubles. In consequence of this, Spain, in alliance with the Emperor, attacked and took possession of the Palatinate. The strengthening of the Spanish power in Germany was by itself inimical to the United Provinces, and the sense of danger was intensified when it was found that the occupation of the Lower Palatinate was part of a plan for marching the Catholic troops overland from Lombardy to the Spanish Netherlands. In view of an impending conflict with their hereditary enemies, it became a matter of grave anxiety to the States to retain the goodwill of England. Accordingly, after many discussions, the States-General at the end of 1620 appointed another embassy to go to London; but it was rather with the view of meeting the political dangers with which they were threatened than of dealing effectually with the subjects in dispute. The ambassadors’ official instructions, which were most carefully considered, referred in general terms to the affairs of Germany and the approaching expiry of the truce with Spain, and more particularly to the cloth trade, the coinage, and the East Indies. On the all-important subject of the herring fishery they were mute. In their private instructions the envoys were enjoined to avoid all discussion about it; if pressed, they were to assure the king that the States would be glad to consider it “later”; and in any discussion that did arise, they were to bear in mind that they always had been in undisturbed possession of it, and that the profit they derived from it had been greatly exaggerated and was far less than the king supposed--so little indeed that they would be quite unable to carry it on if any “innovation” were made.[378]