The crossword solution for the term ACTION, IN WAR is 'COMBAT'. COMBAT is a form of warfare in which two or more opposing forces engage in physical conflict with each other. It is typically characterized by the use of weapons and tactics that are designed to inflict maximum damage and destruction on the enemy. COMBAT can take place on land, sea, or air, and can involve both conventional and unconventional weapons. COMBAT is an integral part of any war, and is often seen as the most intense and dangerous form of warfare.