In the North- Blucher will rush to Minsk but it is not difficult to stop him because you have Golytsin and light artillery there. Just attack him with artillery.
- Make your line of defense at Lublin. You don't want to advance too fast there because if you did, you would soon surrounded by an armies or Prussian.
- Spam light artillery from Minsk and another industry north of Iasi. Send them to help defending Lublin. Single light artillery (no formation) will do because they can stay in the rear shooting and to save you some gold.
- At Lublin, build troops to make a line that prevent the Prussian from attacking your light artillery. If you are short of money then line infantry will do since they are cheap and hardy.
- Just defend Lublin and kill all generals that come close. Your offense will be relied on Golytsin, Alexander, Yermolov, and light artillery. Your line infantry will do the meat shield job so if they are injured, you can spare them from attacking and just let them obstruct the Prussian advance.
- Defending Lublin is hard already so just keep defending, no need to advance yet.
- If you are confident, you may capture Warsaw and make a line of defense there instead of Lublin. But it defending Warsaw is more difficult than Lublin because Prussian artillery can easily attack you right after they are built near Plock and it takes more time for your artillery to reach the front line.
In the South- Latour will attack Iasi and Johann may either go to Iasi or Clujnapoca. Whatever the case, just play defensively. Utilize the fort near Iasi to help defending.
- When you manage to kill Latour and Johann then consider go capturing Debrecen and Lviv.
- Lviv will be left open and AI would probably spawn an infantry when you come close. So it should be easy taking the city.
- Stop you advance at Debrecen and play defensively there.
- Merveldt and Archduke C. will come eventually but not likely together. The attack in the south is not as hard as in the north so you might continue to take Buda and Pest when you feel comfortable but I recommend killing Merveldt first.
In the North 2 - After you kill Kleist, Dornberg, and Clausewitz- Now that most of your enemy's generals are killed, attack Warsaw if you have not taken it earlier.
- If you reach this phase, you should be confident that you would complete the mission. Now just advance slowly, taking the cities along the way (Krakow, Pozman Danzig).
- If your troops in the south are done with Vienna, move them north taking Prague and Dresden along the way.
- Berlin should be defended with Wilhelm alone so bombard him with artillery or just simply use brute force (by then, you'll be rich anyway).
Tips- It's better to send Sophia to the south because you will face more forts there. Moreover, in the north, you have Alexander with Spy skill.
- You have many lv4-5 cities in the rear so you might consider upgrading them whenever you have spared gold so you will be fine in the long run.
- You can leave Belgrade undefended. I find that AI won't capture it