Frederick accepted the crown; but he was no sooner enthroned at Prague than the Bohemians saw themselves foiled in the hopes which had dictated their choice. They had trusted that Frederick's election would secure them support from the Calvinist Union, of which he was the leading member, and from James, whose daughter was his wife. But support from the Union was cut off by the jealousy of the French Government, which saw with suspicion the upgrowth of a great Calvinistic power, stretching from Bohemia to its own frontier, and pushing its influence through its relations with the Huguenot party into the very heart of France. James on the other hand was bitterly angered at Frederick's action. He could not recognize the right of subjects to depose a prince, or support Bohemia in what he looked on as revolt, or Frederick in what he believed to be the usurpation of a crown. By envoy after envoy he called on his son-in-law to lay down his new royalty, and to return to the Palatinate. His refusal of aid to the Protestant Union helped the pressure of France in paralyzing its action, while he threatened war against Holland, the one power which was earnest in the Palatine's cause. It was in vain that in England both court and people were unanimous in a cry for war, or that Archbishop Abbot from his sick-bed implored James to strike one blow for Protestantism. James still called on Frederick to withdraw from Bohemia, and relied in such a case on the joint efforts of England and Spain for a re-establishment of peace. But no consent to his plans could be wrung from Frederick; and the spring of 1620 saw Spain ready to throw aside the mask. The time had come for securing her road to the Netherlands, as well as for taking her old stand as a champion of Catholicism. Rumours of her purpose had already stolen over the Channel, and James was brought at last to suffer Sir Horace Vere to take some English volunteers to the Palatinate. But the succour came too late. Spinola, the Spanish general in the Low Countries, was ordered to march to the aid of the Emperor; and the famous Spanish battalions were soon moving up the Rhine. Their march turned the local struggle in Bohemia into a European war. The whole face of affairs was changed as by enchantment. The hesitation of the Union was ended by the needs of self-defence; but it could only free its hands for action against the Spaniards by signing a treaty of neutrality with the Catholic League. The treaty sealed the fate of Bohemia. It enabled the army of the League under Maximilian of Bavaria to march down the valley of the Danube; Austria was forced to submit unconditionally to Ferdinand; and in August, as Spinola reached the frontier of the Palatinate, the joint army of Ferdinand and the League prepared to enter Bohemia. [Sidenote: The Parliament of 1621.]