The term 'fighting group' can be described by two crossword solutions: CADRE (5 letters) and ARMY (4 letters). A CADRE is a small group of people, usually military personnel, who are trained to lead larger groups. An ARMY is a large organized force of soldiers, typically equipped with weapons and equipment, that is used to fight in wars or other conflicts. Both terms refer to a group of people who are trained and organized to fight in some capacity.