Naval warfare
Early modern

The late Middle Ages saw the development of the cogs, caravels and carracks ships capable of surviving the tough conditions of the open ocean, with enough backup systems and crew expertise to make long voyages routine. In addition, they grew from 100 tons to 300 tons displacement, enough to carry cannon as armament and still have space for cargo. One of the largest ships of the time, the Great Harry, displaced over 1,500 tons.

The voyages of discovery were fundamentally commercial rather than military in nature, although the line was sometimes blurry in that a country's ruler was not above funding exploration for personal profit, nor was it a problem to use military power to enhance that profit. Later the lines gradually separated, in that the ruler's motivation in using the navy was to protect private enterprise so that they could pay more taxes.

Like the Egyptian Shia-Fatimids and Mamluks, the Sunni-Islamic Ottoman Empire centered in modern-day Turkey dominated the eastern Mediterranean Sea. The Ottomans built a powerful navy, rivaling the Italian city-state of Venice during the Ottoman–Venetian War (1499–1503).

Although they were sorely defeated in the Battle of Lepanto (1571) by the Holy League, the Ottomans soon rebuilt their naval strength, and afterwards successfully defended the island of Cyprus so that it would stay in Ottoman hands. However, with the concurrent Age of Discovery, Europe had far surpassed the Ottoman Empire, and successfully bypassed their reliance on land-trade by discovering maritime routes around Africa and towards the Americas.

The first naval action in defense of the new colonies was just ten years after Vasco da Gama 's epochal landing in India. In March 1508, a combined Gujarati/Egyptian force surprised a Portuguese squadron at Chaul, and only two Portuguese ships escaped. The following February, the Portuguese viceroy destroyed the allied fleet at Diu, confirming Portuguese domination of the Indian Ocean.

In 1582, the Battle of Ponta Delgada in the Azores, in which a Spanish - Portuguese fleet defeated a combined French and Portuguese force, with some English direct support, thus ending the Portuguese succession crisis, was the first battle fought in mid-Atlantic.

In 1588, Spanish King Philip II sent his Armada to subdue the English fleet of Elizabeth, but Admiral Sir Charles Howard defeated the Armada, marking the rise to prominence of the English Royal Navy. However it was unable to follow up with a decisive blow against the Spanish navy, which remained the most important for another half century. After the war's end in 1604 the English fleet went through a time of relative neglect and decline.

In the 16th century, the Barbary states of North Africa rose to power, becoming a dominant naval power in the Mediterranean Sea due to the Barbary pirates. The coastal villages and towns of Italy, Spain and Mediterranean islands were frequently attacked, and long stretches of the Italian and Spanish coasts were almost completely abandoned by their inhabitants; after 1600 Barbary pirates occasionally entered the Atlantic and struck as far north as Iceland.

According to Robert Davis as many as 1.25 million Europeans were captured by Barbary pirates and sold as slaves in North Africa and the Ottoman Empire between the 16th and 19th centuries. These slaves were captured mainly from seaside villages in Italy, Spain and Portugal, and from farther places like France, England, the Netherlands, Ireland and even Iceland and North America. The Barbary pirates were also able to successfully defeat and capture many European ships, largely due to advances in sailing technology by the Barbary states. The earliest naval trawler, xebec and windward ships were employed by the Barbary pirates from the 16th century.

From the middle of the 17th century competition between the expanding English and Dutch commercial fleets came to a head in the Anglo-Dutch Wars, the first wars to be conducted entirely at sea. Most memorable of these battles was the raid on the Medway, in which the Dutch admiral Michiel de Ruyter sailed up the river Thames, and destroyed most of the British fleet. This remains the greatest English naval defeat, and established Dutch supremacy at sea for over half a century. Very few ships were sunk in naval combat during the Anglo-Dutch wars, as it was difficult to hit ships below the water level; the water surface deflected cannonballs, and the few holes produced could be patched quickly. Naval cannonades damaged men and sails more than they sunk ships.
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