Final answer:
A military maneuver to attack the enemy's side is known as a Flank Attack. It is a strategic move to gain advantage in battle and has been used effectively in historical battles, supported by tactics described by Sun Tzu.
Step-by-step explanation:
The term used for a military maneuver in which a unit moves to the right (or left) of the enemy's position to attack its side rather than the front is known as a Flank Attack. This tactic involves maneuvering around the side of an army instead of engaging in a direct confrontation, a strategy often used to gain a tactical advantage over the opponent. History illustrates numerous instances where flank attacks have been decisive, such as Grant's capture of Vicksburg, which employed an effective siege in conjunction with flanking tactics. Sun Tzu's writings, especially in The Art of War, advise commanders to use the terrain to their advantage, which often includes flanking movements to outmaneuver the enemy.