The Scottish Jacobites suffered heavy losses in securing victory at Killiecrankie in July 1689, including their leader Viscount Dundee. By May 1690 the rising had been largely suppressed, although pockets of resistance continued in the Highlands until early 1692. At the same time, William III assumed command of government troops in Ireland and gained an important success at The Battle of the Boyne in July 1690, before victory at Beachy Head gave the French temporary control of the English Channel. James returned to France to urge an immediate invasion of England, but the Anglo-Dutch fleet soon regained maritime supremacy, and the opportunity was lost.