There are many synonyms that can be used for the phrase "armed fighting." Some alternatives include: armed conflict, combat, military action, warfare, hostilities, battle, engagement, confrontation, skirmish, and clash. These words all convey the idea of two or more parties engaging in a fight using weapons or other military tactics. While the phrase "armed fighting" is often used to refer to traditional warfare, these synonyms can also be used in the context of guerrilla warfare, civil unrest, and other non-traditional conflicts. Regardless of the specific situation, these synonyms all represent a serious and often deadly form of conflict.