Most of North's government was focused first on the growing problems with the American colonies and later on conducting the American War of Independence which broke out in 1775, beginning with the Battle of Lexington. Following the Boston Tea Party in 1773, Lord North proposed a number of legislative measures which were supposed to punish the Bostonians. These measures were known as the Coercive Acts in Great Britain, while dubbed the Intolerable Acts in the colonies. By shutting down the Boston government and cutting off trade, he hoped it would keep the peace and dispirit the rebellious colonists. Instead, the acts further inflamed Massachusetts and the other colonies, eventually resulting in open war during the Boston campaign. North deferred overall strategy of the war to his key subordinates Lord George Germain and the Earl of Sandwich. Despite a series of victories and the capture of New York and Philadelphia the British were unable to secure a decisive victory. In 1778 the French allied themselves with the American rebels, and Spain joined the war in 1779 as an ally of France, followed by the Dutch Republic in 1780. The British found themselves fighting a global war on four continents without a single ally. After 1778 the British switched the focus of their efforts to the defense of the West Indies, as their sugar wealth made them much more valuable to Great Britain than the Thirteen Colonies. In 1779 Great Britain was faced with the prospect of a major Franco-Spanish invasion, but the Armada of 1779 was ultimately a failure. Several peace initiatives fell through, and an attempt by Richard Cumberland to negotiate a separate peace with Spain ended in frustration.