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

magazine A magazine is a periodical publication, generally published on a regular schedule (often weekly or monthly), containing a variety of content. They are generally financed by advertising, purchase price, prepaid subscriptions, or by a combinatio ...

spaces formed by the armored deck, the waterline

belt Belt may refer to: Apparel * Belt (clothing), a leather or fabric band worn around the waist * Championship belt, a type of trophy used primarily in combat sports * Colored belts, such as a black belt or red belt, worn by martial arts practit ...

, and the transverse bulkheads. In many post-

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

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 non-military 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 other valuable goods. Those who conduct acts of piracy are called pirates, v ...

Citations

Bibliography

* {{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