Such was the temper of England at the end of 1539. Cromwell and his policy, the union with the German princes and the marriage with Anne of Cleves were merely makeshifts. They stood on no surer foundation than the passing political need of some counterpoise to the alliance of Francis and Charles. So long as that need remained, the marriage would hold good, and Henry would strive to dissemble; but not a moment longer. The revolution came with startling rapidity; in April, (p. 393) 1540, Marillac, the French ambassador, reported that Cromwell was tottering.[1088] The reason was not far to seek. No sooner had the Emperor passed out of France, than he began to excuse himself from fulfilling his engagements to Francis. He was resolute never to yield Milan, for which Francis never ceased to yearn. Charles would have found Francis a useful ally for the conquest of England, but his own possessions were now threatened in more than one quarter, and especially by the English and German alliance. Henry skilfully widened the breach between the two friends, and, while professing the utmost regard for Francis, gave Charles to understand that he vastly preferred the Emperor's alliance to that of the Protestant princes. Before April he had convinced himself that Charles was more bent on reducing Germany and the Netherlands to order than on any attempt against England, and that the abandonment of the Lutheran princes would not lead to their combination with the Emperor and Francis. Accordingly he returned a very cold answer when the Duke of Cleves's ambassadors came, in May, to demand his assistance in securing for the Duke the Duchy of Guelders.[1089] [Footnote 1088: _L. and P._, xv., 486.] [Footnote 1089: _Ibid._, xv., 735.]