So after years of playing off and on I finally decided to dive in a make a go at EU3. I can finally balance my economy and politics, fight wars and suppress rebellions. I am playing as the Mamluks and attempting to go for more than my usual 10 years (kept going bankrupt). So it is something like 1414 and the Timurids annexed Deir az-Zour back in the invasion of 1406. I think I wasn't paying attention when I accepted that truce. My army is of superior quality and I have swept the Timurids from Syria, Turkey, Iraq and Iran. My 'warscore' is 56%. They beg for a peace that will give me 5 prestige but no territory. On the 'sue for peace' button annexation of any territory is greyed out. I want my dizzy (Deir az-Zour) back at least.
How do you annex part of a territory?
Ethiopia freely offered 3 territories to me back in 1402 after I had wiped out their army and occupied about half their territory. I accepted as assimilating territory takes time and there is already a lot rebellion in the Mamluk Sultanate. I can't accept a peace without land since I will not have another 50k horde taking me by surprise. I can try to take all of the Timurid territory but it is sooo big and I don't think I can eat a pie that big at once.