Allegiance is a massively multiplayer online real-time strategy and space simulator. Players control spaceships (from small one-man ships to large capital ships), fly in teams with other players, and try to achieve victory through various means, such as destroying or capturing all enemy bases or suppressing the enemy's will to fight. Teams are led by a single commander who makes tactical decisions and invests in technology and bases. Flight and combat are performed from first or third person in a 3D environment, and a real-time top-down "command view" is available for the player's immediate surroundings.