Actually pretty good, even excellent mission I'd say.
You must guard the border, meaning keeping on your side atleast 4 garrisons.
My garrisons were attacked twice, first time garrison itself did the job.
Second time (northest one) enemy pass through, but I was close with hero, and a nice ressurection scroll, so ended that well.
Then inferno hero spawns, and heads towards your town. Had castle and nice number of hunters, so stayed alive.
Needless to say, in whole campaign hunters are your backbone, keep them alive at all costs.
Plus, there are close by two hunter dwellings, though second one was guarded by master hunters, so took that one a bit later.
Findan has a fantastic speciality as well.
Before combat actually start, all shooters fire one free shot, and always targeting lowest level in opposing army.
Absolutelly great for later missions.
Some tips for fighting...at start pick fights wisely, slow walkers preferably at the start, have all 7 slots filled, even cavaliers wont posse much threat when all they can hit is a single pixie, while you pound them with hunters and druids.
Went something like this. Bought another hero day 1, took all the troops on Findan, got both mines and first hunter dwelling. Went a bit down, killed skeletons and horned overseers (small sidenote, seems there are absolutelly no random critters on this map), got deep hydra and went west.
Fought a bit in the middle, got sulphur and gem mines, visited arena, got attacked in first garrison - garrison defended itself. Soon after bought all the troops I could and went for ressurection scroll. Another garrison got attacked, but now necro hero survived (was Vladimir), so Findan had to take back the garrison which was easy as said garrison managed to inflict great damage to Vlad.
Then went for golden bow, suffered some casaulities, but was worth it. Third garrison got attacked by damned Deirdre. Bought again some troops, and succesfully took it back. In the mean time, I got both war dancers dwells. Still just first hunter dwelling.
And as it was second month, Findan started racing for double mana well (even though I didn't actually need it in final battle), and taking second hunter dwelling. Scouts at same time transferred druids for upgrade at hill fort.
Red showed up for sure and started going my way, had all of my scouts stand it her way to slow her a bit down, and it worked. Day 7, she was 2-3 tiles from town.
Before battle had around 95 master hunters, 20 druid elders, 13 treants, 6 ancient treants (some from garrisons, and think you receive 4-5 when red appears - or soon after), 80 war dancers...and 3 unicorns.
Wasn't tough as before (well, this time beat it), as garrison red went through managed to inflict bigger damage this time, plus golden bow is amazing for sylvan troops. Had adv. avenger, expert attack with archery, expert logs, advanced light magic, deadeye shot and rain of arrows.
Now to see what they did to second map...that one was quite tough even before.