The term 'Battle Line' refers to a formation of troops used in warfare. The crossword solutions for this term are FRONT (5 letters), SCAR (4 letters), and PHALANX (7 letters). The term 'FRONT' is used to describe the foremost line of troops in a battle formation. 'SCAR' is a term used to describe a long, narrow mark left on the ground by a battle line. Finally, 'Phalanx' is a term used to describe a close formation of troops, usually in a rectangular shape, used to protect against attack.