In the big deciding battle for the American war of independence it all comes down to taking Yorktown.
This battle focuses around a single well guarded area. The enemy will occasionally sound out forces to attack you and they should be fairly easy to defend.
This is a mission that is mostly about grinding. You will need a lot of unit producing power and all of the upgrades.
The French supported the Americans in the Civil War and it is no different here.
If you knock out a bunch of very powerful guns the French will move in and support you with units.
There is a secondary mission to the east involving destroying all of the defensive structures using a few units you are given. Whether or not you complete this mission has little to no impact on the mission. All of your experience ends and there’s no achievement system.
In this mission it is not so much about what units you choose to use but more about how many units you use. Militiamen will be your best bet because of how cheap they are. Mixing in some mortars or cannons will not be a bad idea either.
The idea is you want consistency, creating a lot of units and sending them out once you get a lot of units.
The mission is long and really it’s just a matter of shortening what you’re doing, as opposed to any particular strategy.