10 most difficult navy riddles

Mikasa is a pre-dreadnought battleship built for the Imperial Japanese Navy. After 1922, Mikasa was decommissioned in accordance with the Washington Naval Treaty and preserved as a museum ship at Yokosuka. Mikasa is the last remaining example of a pre-dreadnought battleship anywhere in the world.

Eurybiades was the son of Eurycleides, and was chosen as commander in 480 BC because the Peloponnesian city-states led by Sparta, worried about the growing power of Athens, did not want to serve under an Athenian despite the Athenians' superior naval skill. For all the enmity between the two, Eurybiades was ultimately assisted by the Athenian naval commander Themistocles.

The introduction of brown powder, which burned less rapidly than black powder, allowed to use longer barrels, which resulted in greater accuracy. Slower-burning powder decreases firing stresses, allowing guns to last longer and to be manufactured to tighter tolerances.

Nuclear reactor requires no oxygen for combustion and emits no exhaust gas. It gives the submarine the ability to operate submerged at high speeds, for unlimited periods, dependent only on the endurance of its crew. Nuclear power revolutionized the submarine, finally making it a true "underwater" vessel, rather than a "submersible" craft.

Most American aircraft carriers are powered by two reactors. The only exception was the early-constructed USS Enterprise, having an eight-reactor propulsion design, with each A2W reactor taking the place of one of the conventional boilers in earlier constructions. Enterprise was meant to be the first of a class of six, but construction costs ballooned and the remaining vessels were never laid down. The design was replaced by two-reactor Nimitz class.

The Spanish Armada was a Spanish fleet of 130 ships that sailed from La Coruña in early summer 1588, with the purpose of escorting an army from Flanders to invade England. During Battle of Gravelines the Spanish fleet was damaged and forced to abandon its plans.

Although each shot of raking fire is more likely to miss the target, it will cause more damage when successful. In addition, the targeted ship will have few or no guns able to return fire. A stern rake tends to be more damaging than a bow rake because the shots are not deflected by the curved and strengthened bow.

Surcouf was the largest French submarine cruiser having served during the Second World War. The boat was lost during the night of 19 February 1942, in the Caribbean Sea, possibly after colliding with an American freighter. Surcouf was named after the French privateer Robert Surcouf. It was the largest submarine built until surpassed by the first Japanese

Although Bolivia has been landlocked since the War of the Pacific in 1879, it still maintains its navy, which patrols Lake Titicaca and Bolivia's larger rivers. The Navy serves as a symbol that the country has not given up on regaining its lost access to the sea. As of 2008, the Bolivian Naval Force had approximately 5,000 personnel.

Santísima Trinidad was a Spanish first-rate ship of the line with 112 guns. She was the heaviest-armed ship in the world when rebuilt, and bore the most guns of any ship of the line outfitted in the Age of Sail.