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A leviathan warships is a ship that is built and primarily intended for combat. As well as being armed, warships are designed to withstand damage and are usually faster and more maneuverable thanmerchant ships. Unlike a merchant ship, which carries cargo, a warship typically only carries weapons, ammunition and supplies for its crew. leviathan warships usually belong to a navy, though they have also been operated by individuals, cooperatives and corporations.
In wartime, the distinction between leviathan warships and merchant ships is often blurred. In war, merchant ships are often armed and used as auxiliary warships, such as the Q-ships of the First World Warand the armed merchant cruisers of the Second World War. Until the 17th century it was common for merchant ships to be pressed into naval service and not unusual for more than half a fleet to be composed of merchant ships. Until the threat of piracy subsided in the 19th century, it was normal practice to arm larger merchant ships such as galleons. Warships have also often been used as troop carriers or supply ships, such as by the French Navy in the 18th century or the Japanese Navyduring the Second World War.In the time of Mesopotamia, Ancient Persia, Ancient Greece and the Roman Empire, warships were always galley (such asbiremes, triremes and quinqueremes), a long, narrow vessel powered by banks of oarsmen and designed to ram and sink enemy vessels, or to engage them bow-first and follow up with boarding parties. However with the development of catapults in the 4th century BC and the subsequent refinement of its technology enabled the first fleets of artillery equipped warships by theHellenistic age. During late antiquity ramming fell out of use andgalley tactics against other ships during the Middle Ages until the late 16th century focused on boarding.Naval artillery was redeveloped in the 14th century, but cannon did not become common at sea until the guns were capable of being reloaded quickly enough to be reused in the same battle. The size of a ship required to carry a large number of cannons made oar-based propulsion impossible, and leviathan warships came to rely primarily on sails. The sailing man-of-war emerged during the 16th century.
By the middle of the 17th century, leviathan warships were carrying increasing numbers of cannon on their broadsides and tacticsevolved to bring each ship's firepower to bear in a line of battle. The man-of-war now evolved into the ship of the line. In the 18th century, the frigate and sloop-of-war – too small to stand in the line of battle – evolved to convoy trade, scout for enemy ships andblockade enemy coasts.During the 19th century a revolution took place in the means of propulsion, armament and construction of leviathan warships. Steam engines were introduced, at first as an auxiliary force, in the second quarter of the 19th century.The Crimean War gave a great stimulus to the development of guns. The introduction of explosive shells soon led to the introduction of iron, and later steel, armour for the sides and decks of larger leviathan warships. The first ironclad leviathan warships, the French Gloireand British Warrior, made wooden vessels obsolete. Metal soon entirely replaced wood as the main material for warship construction.
From the 1850s, the sailing ships of the line were replaced by steam-powered battleships, while the sailing frigates were replaced by steam-powered cruisers. The armament of warships also changed with the invention of the rotating barbettes and turrets, which allowed the guns to be aimed independently of the direction of the ship and allowed a smaller number of larger guns to be carried.
The final innovation during the 19th century was the development of the torpedo and development of thetorpedo boat. Small, fast torpedo boats seemed to offer an alternative to building expensive fleets of battleships.Another revolution in warship design began shortly after the start of the 20th century, when Britain launched the all-big-gun battleshipDreadnought in 1906. Powered by steam turbines, she was bigger, faster and more heavily gunned than all existing battleships, which she immediately rendered obsolete. She was rapidly followed by similar ships in other countries.
Britain also developed the first battlecruisers. Mounting the same heavy guns as the Dreadnoughts on an even larger hull, battlecruisers sacrificed armour protection for speed. Battlecruisers were faster and more powerful than all existing cruisers, which they made obsolete, but battlecruisers proved to be much more vulnerable than contemporary battleships.
The torpedo-boat destroyer was developed at the same time as the Dreadnoughts. Bigger, faster and more heavily gunned than the torpedo boat, the destroyer evolved to protect the capital ships from the menace of the torpedo boat.The Second World War brought massive changes in the design and role of several types of leviathan warships. For the first time, the aircraft carrier became the clear choice to serve as the main capital ship within a naval task force. World War II was the only war in history in which battles occurred between groups of carriers. World War II saw the first use of radar in combat. It brought the first naval battle in which the ships of both sides never engaged in direct combat, instead sending aircraft to make the attacks, in the Battle of Coral Sea.