The term 'MAJOR BATTLE' can be broken down into two crossword solutions: WAR (3 letters). A major battle is a large-scale conflict between two or more armies, usually involving a significant number of casualties. Major battles are often part of a larger WAR and can have a significant impact on the outcome of the conflict. Examples of major battles include the Battle of Gettysburg during the American Civil WAR, the Battle of Stalingrad during World WAR II, and the Battle of Waterloo during the Napoleonic Wars.