| Complete Sequence 05 | Limit the ship's damage to 50% |
| Use a mine to eliminate a gunboat | |
| Limit damage from the fort's mortars to 50% |
Sail for the green zone to encounter the first set of enemy ships that attack your ally. The key to the optional objective is to be quick and use your cannon and swivel fire effectively. Start with a broadside on groups and use the swivel to take out individual shots between reloads. When there are no more enemy targets, use the swivel gun to shoot the mines and clear a path for yourself and your ally.
Your ally boat can be very stupid, so it is always a good idea to take out all sets of mines and you pass through the narrow passage. An added bonus to shooting every set of mines is that a gunboat is parked nearby a set and will complete the second optional objective.
When you reach the ocean again, you will encounter a fort that fires on your ship. You will need to use the broadside cannons on the three towers while avoiding their fire. Sail at full sail to move out of mortar range and don't be afraid to cut back to half sail and veer away from the mortar fire. Keep moving to avoid mortar damage and you should have no issue completing the optional objective (there is a checkpoint directly before you engage the fort if you fail).
