What tactic employs indirect approaches to gain advantage over the enemy?

Maneuver is the correct choice because it focuses on using indirect approaches to create advantages over the enemy. This tactic emphasizes agility, speed, and flexibility, allowing forces to exploit vulnerabilities in the opponent's defenses or to position themselves favorably while avoiding direct confrontation. By employing maneuver, a force can achieve a positional advantage, disrupt enemy plans, and often lead to an outcome where the enemy is unable to respond effectively.

Other options, such as attrition, involve directly engaging the enemy to wear them down, which does not typically incorporate indirect tactics. A counterattack seeks to regain lost ground by directly confronting the enemy after an initial attack, while defense is primarily about holding a position against an attack, rather than exploiting opportunities through indirect means. Maneuver, therefore, stands out for its strategic use of speed and deception to outmaneuver the enemy in a way that directly aligns with the concept of gaining advantage through indirect approaches.