The determining factor in this change of attitude, practically involving a French war, is probably to be found in Henry's relations with Spain. It was of vital importance to him to get his dynasty recognised in an emphatic form by foreign Powers. In Spain under its very able rulers he saw the most valuable of allies, and during the first half of 1488 he had made it his primary concern to procure the betrothal of his own infant son Arthur to their infant daughter Katharine. And virtually his hostility to France was the price they demanded. The preliminaries were settled in July, 1488; the treaty was not definitively signed till March of the next year; and as the essential nature of the Spanish requirements became more apparent, Henry found himself compelled to accept active antagonism to France as part of the bargain. With his subjects, a French war was always secure of a certain popularity, though the provision of funds for it would entail a degree of opposition. Moreover, though foreign wars might give extreme malcontents their opportunity, it is a commonplace of politics that they distract attention from domestic grievances. Thus it is easy to perceive how the benefits of the Spanish alliance would very definitely turn the scale. And we shall still find that Henry had no intention of expending an ounce of either blood or treasure which might be saved consistently with the ostensible fulfilment of the Spanish Compact. [Sidenote 1: 1489 Preparations for war with France] [Sidenote 2: Spanish treaty of Medina del Campo] So in December, 1488, Henry was sending friendly embassies to all the Powers, but while that to France was merely offering mediation, the envoy to Brittany was offering military assistance--on terms. In January a new Parliament was asked for, and after considerable debate granted, £100,000. In February the embassy to Maximilian concluded an alliance for mutual defence; while that to Brittany pledged Henry to defend the young Duchess, but exacted in return the occupation by the English of sundry military positions in the duchy, and the right to forbid any marriage or alliance except with Maximilian or Spain. Then in March the Spanish treaty was completed: whereof the terms were very significant. The children were to be betrothed. If Spain declared war on France, England was to support her. Spain might retire independently if she recovered the small districts of Roussillon and Cerdagne, which had been surrendered (though only in pledge) to Lewis XI.; England might similarly withdraw if she got back Guienne--a very much more visionary prospect. Otherwise, one was not to retire without the other being equally satisfied. If England attacked France, Spain was to help; but occupied as she was with Granada the amount of aid likely to be forthcoming was problematical. In brief, Henry was prepared to pay for the marriage, and Spain could exact a high price.