The term 'Trojan Horse' refers to a TRICK or stratagem used to deceive an enemy. The crossword solutions for this term are 'TRICK' (5 letters) and 'fifthcolumn' (11 letters). The term 'Trojan Horse' originates from the story of the Trojan War, in which the Greeks used a large wooden horse to gain access to the city of Troy. Inside the horse were Greek soldiers who were able to open the gates of the city and allow the rest of the Greek army to enter. This strategy is often used metaphorically to describe any deceptive tactic used to gain access to a place or situation.