Inferno – “A marriage between heaven and hell” [Campaign 5, Mission 4].

Hello everyone!
Nothing is working out(((
In my game, on "Easy" difficulty, besides the Temple hero, I also have two Knights.
I captured the central city by the water, joined the Dark elements, but they are sitting in the forts and won't let me get to it. If possible, could someone who has completed the mission describe the strategy for completing it?
Thank you.

I reached the 4th mission. I'm still continuing to play. I started by fighting Sarah, clearing everything around the city, and then moving upwards. There are three directions there. I went along the central road, captured the first Temple fort. Then I reached the tomb guarded by Necromancers and took about 50 Dark elementals from them. And then I went to the Temple Castle. There were 2 heroes there. The first one was difficult, and the second one was easier. I killed the difficult one with some losses, and the main Temple hero :smile16: without any losses, and captured the castle. But after that, there was another battle with the same main Temple hero. I rebuilt the castle, waited until the beginning of the week, gathered the reinforcements, and attacked him. Despite the fact that he was "powerful," I killed him with almost no losses. :smile49: "Greater Drought" and Phoenixes are awesome!!!! Now I'm running around the map :smile17: and destroying the Dark elements. So, it's better to deal with the Temple hero at the beginning and then you can move around the map without problems. I don't know how it will all end for me, but so far, there hasn't been anything difficult in this mission.