Mark 21 nuclear bomb
The Mark 21 nuclear bomb was a United States nuclear gravity bomb first produced in 1955. It was based on the TX-21 "Shrimp" prototype that had been detonated during the Castle Bravo test in March 1954. While most of the Operation Castle tests were intended to evaluate weapons intended for immediate stockpile, or which were already available for use as part of the Emergency Capability Program, Castle Bravo was intended to test a design which would drastically reduce the size and costs of the first generation of air-droppable atomic weapons (the Mk 14, Mk 17 & Mk 24). At long, in diameter, and weighing , the Mk-21 was half the length and one-third the weight of the Mk-17/24 weapons it replaced. Its minimum yield was specified at four megatons.
Siege of Castelnuovo
The siege of Castelnuovo ended the failed campaign of the Holy League against the power of the Ottoman Empire in the Eastern Mediterranean. Charles V began negotiations with Barbarossa to attract him to the imperial ranks but in vain, and turned all his efforts in a great expedition against Algiers to destroy the Ottoman sea power. This expedition, known as the Journey of Algiers, ended in a disaster as a storm scattered the fleet and the army had to be reembarked having suffered heavy losses. A truce between Charles V and Suleiman the Magnificent was signed in 1543. Castelnuovo remained in Ottoman hands for almost 150 years. It was recovered in 1687, during the Morean War, by the Venetian Captain-General at sea Girolamo Cornaro, who in alliance with Montenegrins under Vuceta Bogdanovic, won a great victory over the Turks near the town and put the fortress under Venetian rule.