The Sunset of the King
Fifth Mission

Objectives:
1) Free the queen and capture Danmoor within a week.
2) Hold Danmoor.
3) Recover and install the Tear of Asha in Danmoor.
4) Send Godric to Nicholas for help.
5) Isabelle and Godric must survive.

Walkthrough:
I am still in the process of completing this mission (I've passed it twice before without much trouble—though I don't recall the details—and this third attempt is also going smoothly). I'll explain in detail how I'm doing it:
Godric runs toward the Fortress of Danmoor (it's shown at the very beginning, if I remember correctly); he runs without stopping and captures the city. Then, before the week ends—above the city, there is a round tower (on one side are dragons guarding a mine, and on the other is this prison tower where Isabelle is held). I free Isabelle, watch the cutscene, and transfer all troops to Isabelle—she is a leveled-up 22nd level hero with max luck and morale, and war machines (the ability to resurrect some fallen troops with a tent). Isabelle runs down the road (the one Godric arrived on) and takes the ore mine (which is right nearby). Meanwhile, Godric, with one peasant, heads along the side road (the topmost one). He sees gargoyles guarding the sawmill and dogs blocking the road further ahead—he rides back to the castle. In the castle, during these couple of days before the enemy hero arrives, don't forget to build: gold-generating buildings, troop dwellings, and other things... Build and buy whatever we have time for. Isabelle, having successfully marked the ore mine, rides back to the castle. An enemy hero is already hot on her heels. Godric rides behind the castle, picks up wood, and waits under the noses of the dragons. You could, of course, not rush Godric behind the castle and leave him on the road by the dogs, but then there's a chance the opponent will move toward Godric first. I once had a situation where Godric wasn't behind the castle, and the enemy hero turned toward him and killed him... that's why Godric is outside the city by the dragons. Isabelle easily fends off attacks while staying in the castle. Everyone stays in the castle, no one goes out—the enemy sends their walking troops themselves, they run onto stakes, getting wounded/dying... We emerge from the battle with practically no losses (the main thing is to take out the enemy's ranged monsters first). After the battle, the queen rides to the dragons and hits them (killed them without losses—thanks to leveled-up luck and the double damage she provides). Then she goes to the sawmill and kills the dogs at the same time, so Godric can continue along the road. Godric marks the mine outside the city (the dragons are no longer a problem), goes to the sawmill, then happily rides along the road, no longer blocked by Inferno dogs, to the top right corner of the map. We have the castle on the left and an obelisk on the right. Don't forget to build buildings in the castle. Isabelle, having removed the obstacle of the dogs, rides back to the castle again. There she repels another attack, and we watch the cutscene about the Tear of Asha (which must be found via the obelisks). You can give Isabelle more troops if possible. Immediately after the second battle—Godric just manages to visit the first obelisk, while Isabelle rides down, sees another obelisk guarded by skeletons, and visits it. I didn't even visit the third Obelisk. I found two landmarks (a book on a pedestal by the road and a portal-exit). I roughly calculated where the tear should be (on the puzzle map, by the way, it looks like a golden casket. In Heroes III it's a cross, but here it's a casket). I placed Isabelle in one spot and Godric slightly northwest of her. I dug with Godric—"it's to the southeast," I dug with Isabelle—"it's to the west." I sent Isabelle back to the castle; Godric shifted and dug half a step from Isabelle's excavation. The Tear of Asha was recovered on the third attempt). Meanwhile, Isabelle repels the third attack. Given that the enemy is already exhausted and arrives with only a weekly or bi-weekly army, and we suffered practically no losses in previous battles and even replenished our army, we fend them off without losses. Godric carries the artifact to the city; we build the Sentry of Elrath (the Tear of Asha makes this possible). Next, Isabelle rode down the road toward the bridge. Godric, taking two knights, rode toward the Dungeon. Godric doesn't fight for now, he doesn't need an army—he's just a scout (although two knights easily took down 60 demons on the road just like that))). Isabelle rides to the bridge, crosses into enemy lands, and brazenly stands at the enemy gates, not letting the opponent stick their nose out. Then she starts taking over, marking mines, and kills a carelessly emerging Inferno hero with a meager army (Isabelle's army: 24 regular griffins, 17 royal griffins, 86 archers, 132 peasants, 14 knights, 11 monks, 79 crusaders). Then she rides further through enemy lands; thanks to diplomacy, she recruits 35 succubus (she tossed the peasants). Meanwhile, one of the enemy heroes slips through and runs toward the castle. His army is weak; by this point, I have in the castle: 7 knights, 15 monks, 56 crossbowmen, 4 angels, 111 peasants, 22 royal griffins, 45 crusaders. But the enemy is running and doesn't turn into the castle. Instead, he goes past, toward the Dungeon. There we have Godric without an army. So I hire another hero (it was Rutger), and I intercept the enemy hero so he doesn't run toward Godric... I'm still completing this mission. Godric received the troops that were in the castle from Rutger; now he's running around clearing the Dungeon, gaining experience. The queen is roaming enemy lands, not giving the opponent a chance to enter the castle. Troops are also accumulating in the castle... When I bring Godric and the queen to their development limit and visit all the upgrades—Godric will run to Nicholas—the garrison is right next to the one with thousands of troops. I'll then lead the queen further away, so Agrail doesn't decide to turn toward her and attack... After Godric disappears from the map, on the next turn (I think), Nicholas should appear. He will appear, run at Agrail, then a cutscene and the end of the campaigns. Thanks to everyone who read, I'm glad if my tips help someone... As I move forward, I'll describe other missions. Probably...
And now we can consider that this mission is also completed. End of the first campaign))