Like any shield generator, the Bulwark is vulnerable to any units that can get inside the shield, especially submarines. It is not very difficult for units to get inside and target the Bulwark itself, so keep a sharp eye out when battling an enemy fleet. The Bulwark is rather speedy, so take care that that it doesn't zoom ahead of the rest of your navy unsupported. Its speed does help it catch up if it falls behind your fleet, however, or to flee from the enemy if the rest of the fleet is sunk. The shield radius is massive and can easily protect a fleet of ships, but be careful as the shield isn't exceptionally powerful. This unit is especially useful when protecting a fleet that is bombarding the shore from defenses such as Ravagers and Artillery.