Скачать или смотреть Stronghold Crusader Definitive Edition (Extreme Difficulty) - 71. Vantage Point

That's a very weird mission.
You can kill Emperor Frederick right at the beginning with a european swordsmen rush (if you don't kill him, he will harrass you later and won't let you farm). I also tried a rush with macemen and arabian swordsmen, but didn't work out as they were dying to the barrage of arrows.
His gate has only 2 spots from which it can be attacked, so you have to keep picking duos of your swordsmen to attack it, which is really tedious.
You have to place your buildings right at the start, otherwise the enemies will place them at your location. Build them, then put them asleep if you want to rush on the Emperor.
The yellow Nizar is blocked at the beginning and cannot do anything. However this can change later in the game. In my previous failed attempt i got caught off guard by this yellow Nizar who somehow unblocked himself, so keep in mind that it can happen.
Better dig a moat on both sides of your castle, even though the north-east path seems to be death-end at the beginning. I wasn't building a moat in my previous attempts (only a tower at the north-west passage) and the assassins somehow kept sneaking to me and killing me or my buildings and I had no idea where did they come from. Just block access to your keep and farm up until you have large enough army to siege both Nizars.