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Attacks a row. Medium damage, high health. Deals extra damage to Aircraft Carrier, but suffers more damage from Submarine.
Recommendation:
Attacks a single unit. Highest damage, low health. Deals extra damage to Battleship, but suffers more damage from Frigate.
Attacks a line. High damage, medium health. Deals extra damage to Submarine, but suffers more damage from Aircraft Carrier.
Attacks all enemy units. Medium damage, medium health. Deals extra damage to Frigate, but suffers more damage from Battleship.