Naval warfare changed out of all recognition from the late sixteenth century onwards through the rapid development of large square-rigged warships carrying heavy broadside gun batteries. A whole series of developments followed, with a long (if far from smooth) evolution in ships, equipment, strategy, and tactics continuing down to the last sailing navies of the early nineteenth century. It was clearly no accident that this naval revolution coincided with a great age of global European empires, which would have been impossible to create or maintain without effective naval power. Galleys and other oared craft became largely obsolete, except for some amphibious operations in the Mediterranean and for use in shallow waters around the innumerable Baltic islands. The crushing Dutch victory over a Spanish fleet at the battle of the Downs (1639) marked the first occasion when the full power of broadside gunnery became evident. Then the three Anglo-Dutch wars between the 1650s and 1670s saw a series of savage and bloody engagements between the fleets of two nations that were coming to be known as the Maritime Powers. The combination of imperial and trading ambitions, new financial arrangements, and relatively open societies enabled first the Dutch, and then the British, to develop naval power to new heights, in turn allowing them to punch well above their weight on the international stage. Under Louis XIV, France did mount a serious challenge to the Dutch and English, and for a time possessed the largest navy in the Western world. However, by the 1690s the French, and more gradually the Dutch, were finding the costs of maintaining this level of power at sea, as well as on land, to be too great.