I found that their capitol was not well defended but Ankara had three stacks around it. One of the stacks allowed my veteran army to capture the city and then decided to counter-attack. Two stacks of mixed troops ...I thought I might be in trouble but they really were nothing to handle.
After that, there were no real challenges from them. They had several navies spamming up the Mediterranian and I finished them off fairly quickly. They did have some of the better ships that I captured in the game in those navies.

This happened in the late game. The war was started by them , but finished by me. Some faction emerged (the Malamukes?) in some of their territories. I had been trading with them prior to that, so I had no need for their provinces.