As an interesting note in American history George Washington learned (along with all of his colonels) guerrilla tactics during the Seven Years War. He would later use these new updated tactics that gave him such troubles in the Seven Years War against the British to liberate America. In this mission George Washington, just referred to as Colonel Washington, admits that Warwick is out of control and promises to give aid to finding him and knocking him out.
Colonel Washington offers British fleets in defeating Warwick.
The start of this mission involves moving north and taking out the northern bases. Be careful, there are now max upgraded towers which do splash damage. This means you will absolutely need cannons to take this out. If you have them in your deck, good for you.
After you beat this village you will gain access to transports. These transports have a very high powered ability. Instead of transporting your army across the sea and taking out the enemy use these transports to shell out enemy unit producing structures or enemy units. I would not choose to attack without the special ability Broadside Attack which also has an area of effect component.
At this time you should get your Age maxed out and start producing large quantities of heavily upgraded units. I would not move until every unit is max upgrade. I use heavy musketeers supported with cannons. There are not enough cannons on the enemy side to get cavalry.
After you destroy the southern tower on the western land you will gain access to a large fleet. However the second you attack the entire mass army of the enemy will march south. So you will want to keep his army north by harassing him with your transports while having one or two drop off your units south. These same transports should be available to pick up the units if the enemy’s units are moving south. This allows you to effectively strike two points at once and do heavy amounts of damage.
Once you destroy this you will gain large British ships. The most important is the ability of Mortar. If you want to make this easy run your heroes into the enemy Town Center. With this you can mortar down his Town Center and win without having to fight a battle. Otherwise you can just push forward and use your large fleet to support your attack.
There are two ships to the north that you also have to kill, but by this point that should be a matter of right clicking on it.