In Scotland, the policy of destruction adopted by the English throughout 1544 had driven the country to a temporary rally, and a severe reverse was inflicted on the Southron, beguiled into an ambuscade, at Ancram Moor in February 1545; whereby Francis was encouraged to maintain, and Charles to assume, hostility to Henry: who in turn unsuccessfully sought the Lutheran alliance--a failure due to the persistent distrust of the German Princes, who could never make up their minds whether the promises of the King or the Emperor were the less to be relied on. To the quarrel over the desertion of England by Charles at the peace of Crepy, was added a quarrel over the seizure by the English of Flemish ships carrying what would now be called contraband of war, and the arrest in retaliation of English subjects in Flanders. [Sidenote: A French Invasion] The isolation of England was complete: and Francis now looked to effect a successful invasion; to which end a great fleet was collected. But there was now a respectable English navy, supplemented by ships from every port on the southern coast. The threat of invasion raised the whole country in arms. In the latter part of July, the French armada was off the Solent, and a landing was accomplished in the Isle of Wight; but though there were various demonstrations and a few skirmishes, there was no general engagement. The French could not get into the Solent: the English would not come out in force, so long as the lack of a sufficient breeze gave the fighting advantage to the enemy's oar-driven galleys. Finally, plague broke out in the French fleet which retired about the middle of August. Its dispersion allowed of the relief of Boulogne; which was becoming somewhat straitened, being blockaded on the land side by a large army. [Sidenote: 1546 Terms of Peace]