Aspects of this topic are discussed in the following places at Britannica.
On the seas, naval forces may attack enemy warships. The sinking of the Argentine warship General Belgrano, therefore, was not contrary to international law despite its being attacked outside the Total Exclusion Zone that the British government had declared around the Falkland Islands.
in naval warfare: The age of the guided missile )...after World War II, were observed several modern influences on naval combat. First, submarines were formidable weapons, not only in the sinking of an obsolescent pre-World War II cruiser (the General Belgrano, formerly the USS Phoenix) by a nuclear-powered attack submarine (HMS Conqueror) on May 2 but, less obviously, in the harrying of the whole British fleet by one...
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