The term 'Advance Troops' refers to a military strategy in which troops are sent ahead of the main force to scout out the area and prepare for battle. The crossword solution for this term is 'VANGUARD, ' which is a term used to describe the leading group of troops in an advance. This group is typically made up of the most experienced and well-trained soldiers, who are responsible for scouting out the area and preparing for the arrival of the main force.