In a warship, an armored citadel is an armored box enclosing the machinery and

magazine A magazine is a periodical literature, periodical publication, print or digital, produced on a regular schedule, that contains any of a variety of subject-oriented textual and visual content (media), content forms. Magazines are generally fin ...

spaces formed by the armored deck, the waterline belt, and the transverse bulkheads. In many post-

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

warships, armor was concentrated in a very strong citadel, with the rest of the ship virtually unprotected, which was found to be the most effective defence; this is referred to as all or nothing armor. In a civilian ship, a citadel is a secure space equipped with means of communication and emergency supplies, used typically in case of

piracy Piracy is an act of robbery or criminal violence by ship or boat-borne attackers upon another ship or a coastal area, typically with the goal of stealing cargo and valuable goods, or taking hostages. Those who conduct acts of piracy are call ...

All or nothing

In warships, the All or nothing technique on naval vessel armor is known for its use on

dreadnought The dreadnought was the predominant type of battleship in the early 20th century. The first of the kind, the Royal Navy's , had such an effect when launched in 1906 that similar battleships built after her were referred to as "dreadnoughts", ...

battleships. The concept entails strongly armoring the ship's most essential areas while leaving the remainder of the ship unarmored. The “all or nothing” strategy eliminated weak or moderate armor thicknesses: armor was utilized in the largest possible thickness or not at all, providing “either total or negligible protection”. Compared to prior armoring systems, “all or nothing” ships had heavier armor that covered a smaller area of the hull.

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* {{cite book, last1=Raven, first1=Alan, last2=Roberts, first2=John, title=British Cruisers of World War Two, year=1980, publisher=Naval Institute Press, location=Annapolis, MD, isbn=0-87021-922-7 Ship compartments Naval armour

All or nothing

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