viewtopic.php?f=7&t=1439&p=12802#p12802
And Gareth, the author of the scenario, makes the following post within it:
Mytholder wrote:In retrospect, the huge issue with the adventure isn't the unwinnable fight - it's having two of them in close succession. I could have got away with having either the "you can't beat the orcs fight, but the eagles rescue you" encounter OR the "town is besieged, you're captured" one, but both is bad design. I fell into the trap of having a scene in my head that I wanted to evoke ("the eagles! the eagles!"), and didn't set things up as well as I should.
You do need almost overwhelming numbers of orcs for the story to work - if the PCs could reasonably defeat Irime's pursuers, it makes her and Legolas look fearful and weak, which is absolute poison to the setting. Still, there should have been a few alternate endings for the fight - maybe the PCs defeat the first wave of orcs and manage to break the siege and ride out. That still leads up to the High Pass and the rest of the adventure.
The second unwinnable fight - the battle in the dream version of the town - is unwinnable because the PCs are going to end up in prison. There, it's a dream, an evil spell cast by the Gibbet King, and being compelled and railroaded is part of the horror. I've no problem with that battle being unfair and unwinnable, because it's not a 'real' encounter. If you really, really wanted to give the players maximum freedom, you could have an ending where they win the fight and escape the town - then they wake up for a moment, see Irime battling the spirit, and then find themselves in chains being marched south by the same raiders they just killed, making it clear that all this is an illusion or nightmare.
There's a vast difference between "unwinnable fights" and "taking away the players' freedom of choice". Unwinnable fights are perfectly "fair". (Ultimately, the whole of the war against the Enemy is unwinnable!) There are vast armies of orcs and other monsters, and sometimes the PCs will run into them and be unable to triumph through force of arms. What's up to the players - and what Those Who Tarry handles badly in places - is what they do when combat will not avail then.