In this final mission of Act 1, the Circle of Ossus has been after the Circle of Youth and have setup a large base and large fleet around it. After getting aid from the Ottomans and the Pirates, Morgan Black has decided the only way to deal with this betrayal of the Knights of St. John… is the destruction of the fountain.
The goal of this mission revolves around a very powerful mounted cannon that has a very large range and very large amounts of damage.
This mission will revolve around an appropriate balance of units in order to protect the mounted cannon and keep it alive.
First off you will need a sizeable ground force. It should be composed of mostly crossbowmen, but a few pikemen and some mobile cannons will not hurt either. Any unit you can get shipped in will help as well.
For your navy you will want to get to three ships at all time. The mounted cannon has a minimum range meaning that ships that get really close it will not be able to attack. This means you will need a small group of ships to defend the cannon from ships that get too close.
Your land force has to defend the cannon against large ground attacks. As well it should eliminate the small town near by so that you will have overall less enemy units to deal with. You can use the mounted cannon to eliminate defensive structures and use your army to get rid of all the other buildings. I would wait until you have a few mobile cannons before pushing into this.
The mounted cannon as far as attacks should prioritize enemy ships (that are in range of attack) local town structures, and then the fountain.
You also unlock the ability to make fire ships. Each one of these deal 2,000 damage instantly making them very powerful against the fountain, and enemy ships… but of course they should all be used against the fountain. The more ships you get in the better.
However, it is about balance. You will need minimum three ships at all time and should always have a large ground army to make sure you keep the mounted cannon.
Once the fountain falls below 50% you will have to deal with the enemy hero and a small group of units. If your army is not big enough you will lose the cannon, your fleet, and will be set back many many minutes.
If you keep to the same balance of units in the game and only use extra resources to get fire ships you will slowly beat the mission. Expect on hard difficulty it will be about 30 minutes.
When deploying fire ships use your cannon to sweep of any ships in the vicinity before sending them out. After that make sure your own ships are not blocking the path of the fire ships, just stuff to make it easier for you.
Each fire ship will do 2,000 damage to the fountain and each cannon shot will do 50 damage, so obviously it is about maximizing your fire ship numbers while maintaining your fleet size and your army size.
Because of the length of this mission it is advised early on to work up a heavy economy and get all economic upgrades. The mission will end the second the fountain of youth hits 1 health point.