Taught by the experience of the last conflict, the chief effort of the French king, in the general war he had brought upon himself, should have been directed against the sea powers,--against William of Orange and the Anglo-Dutch alliance. The weakest point in William's position was Ireland; though in England itself not only were there many partisans of the exiled king, but even those who had called in William fenced his kingship about with jealous restrictions. His power was not secure so long as Ireland was not subdued. James, having fled from England in January, 1689, landed in Ireland in the following March, accompanied by French troops and a French squadron, and was enthusiastically welcomed everywhere but in the Protestant North. He made Dublin his capital, and remained in the country until July of the next year. During these fifteen months the French were much superior at sea; they landed troops in Ireland on more than one occasion; and the English, attempting to prevent this, were defeated in the naval battle of Bantry Bay.[68] But although James was so well established, and it was of the utmost importance to sustain him; although it was equally important to keep William from getting a foothold till James was further strengthened and Londonderry, then passing through its famous siege, reduced; and although the French were superior to the united English and Dutch on the seas in 1689 and 1690; nevertheless, the English admiral Rooke was able, unmolested, to throw succors and troops into Londonderry, and afterward landed Marshal Schomberg, with a small army, near Carrickfergus. Rooke stopped intercourse between Ireland and Scotland, where were many Stuart partisans, and then with his small squadron passed along the east coast of Ireland, attempted to burn the shipping in Dublin harbor, failing only through lack of wind, and finally came off Cork, then occupied by James, took possession of an island in the harbor, and returned in safety to the Downs in October. These services, which raised the siege of Londonderry and kept open the communications between England and Ireland, extended throughout the summer months; nor was any attempt made by the French to stop them. There can be little doubt that an effective co-operation of the French fleet in the summer of 1689 would have broken down all opposition to James in Ireland, by isolating that country from England, with corresponding injury to William's power.