errant_knight wrote...
That was the initial question I posited at the beginning that we've gotten away from. Having put the Orlesians into play, having secretly negotiated the treaties because he thought it was important to have their aid, why wouldn't Cailan wait? What did he know?
I think we have to consider Draxynnus's excellent post:
draxynnus wrote...
One thing to note here...
What did "waiting" really entail? The Darkspawn came to Ostagar, after all, not the other way around, and presumably they would have had to have been fought as soon as they arrived regardless of whether or not Redcliffe or Orlesian forces were present...unless "wait until reinforcements arrive" was code for "pull back". It's possible that Cailan was putting up a show of bravado to explain his behaviour when his real concern is that he felt at least attempting to stop the Blight at Ostagar rather than it having the opportunity to rampage through the Bannorn until it could be stopped at some other fortress was worth the risk, even if he privately felt that there was the likelihood that he'd lose this one. His other preparations, such as inviting the Orlesian Grey Wardens and possibly conspiring with Duncan to invoke the Warden Treaties, are his way of ensuring that the Blight can still be stopped if the Battle of Ostagar is lost.
Putting himself on the front line was essentially a political move - he was hoping that putting the king of Ferelden in danger would force Loghain to commit, and was gambling that if things went sour he at least might be able to withdraw with the aid of Loghain's distraction. Of course, neither of those worked out in the end...
Anyway, tl;dr: Was Cailan's bravado really bravado, or was it a cover for caring about the people of Lothering and other settlements that would be exposed if Ostagar was abandoned, people which others such as Loghain would likely be all too willing to sacrifice?
Perhaps, like Alistair leaving Lothering, Cailan found leaving the populace he ruled at the mercy of the darkspawn to be intolerable.
I really wish I had a detailed map of the terrain in that area. However, since I don't, all I can do is speculate.

From everything they said, Ostagar was a place that was very easy to defend. I got the impression they could have easily held out even with odds greater than 10 to 1 against them. We don't know how easy it would be for the darkspawn to go around Ostagar. If it was easy to go around, then we don't know why the darkspawn would choose to take the path they did. While it seems improbable that the gorge is a natural choke point for a large radius around that point (but without a map, we don't know), but if it was, then just defening that should have been enough to halt the darkspawn.
And that brings me to the utter lack of intelligence shown in the battle plan. Were there no rogues there to set traps? No one that could make shrapnel or other traps? No materials to make these traps? Knowing where the enemy would be marching, I would have laid my minefield, er traps, across their path.
If holding that gorge was key, why were there no defensive bulwarks built. I know the Ferelden troops are not a Roman army, but surely they could have done a lot with even a few hours of work. Why weren't there raised platforms for archers to fire from? (Not to mention why did the archers only fire one volley of arrows?)
Why are the best armored, and slowest troops, set up as the ones that will charge the flank? Why are the ligher armored and more maneuverable troops put into place where they should not be moving, but holding a defensive line? Why did Cailan's part of the troops run out to attack and lose any advantage they had of formation fighting? (If they charged, it should have been timed either with Loghain's attack, or after Loghain's attack had distracted the darkspawn.)
Why were there no mages casting fireballs or blizzard or whatever into the masses of darkspawn? Why were ballista inside the Tower of Ishall instead of outside where they could be used against the darkspawn.
It's really difficult to know what should be done here. I can easily see Cailan being willing to make a suicidal stand against the darkspawn to protect his people. It's perfectly in character for him. I can't see that at all from Loghain, and I can't see why there was no one there who had enough brains to make Loghain's "plan" more effective.
Was this really all carefully thought out by the devs? Or perhaps we're just projecting ourselves into flaws or holes in the game's design. This game is just too engaging.