The phrase ‘Articles of War’ refers to the rules and regulations formulated to govern the conduct of a nation's military and naval forces. This term was first used by Robert Monro in 1637. It is used to refer to military law in general.
To be more specific, the term is used to refer to the British regulations drawn up as a result of the Glorious Revolution, and the US regulations later based on them. The Second Continental Congress established 69 Articles of War to govern the conduct of the Continental Army in the year 1775. The military justice system operated under the Articles of War until the Uniform Code of Military Justice came into effect on May 31, 1951.