I'd love a definitive history of the Templar-Mage War, though.
Battles fought.
Generals.
What sorts of tactics were used.
Do you think we'll see that in WOT2?
Doubt it.
The closest thing to major battles we've heard of was how the Templars crushed a few Circles (which may or may not have been Kirkwall and the one in Rivain). During the initial stages, there were also mini-civil wars within various Circles between the rebels and those who refused: the Loyalists won at Vivienne's Circle, and appear to have lost in most other places. At least one Circle appear to have remained Neutral- mages and Templars alike staying put and not joining the war (it's a war table mission). I'm not sure about Ostwic Circle (the player's).
After that, the mages appear to have been poorly organized refugees trying to hide, hiring mercenaries to supplement their fighting against the Templars. Concept arc has a pretty consistent theme of 'mages being cornered by Templars.' Fiona says that they (the mages) were losing the war, which supports what we see at the crossroads where the only major mage force in the field (the mad apostates) are more or less checked by a splinter Templar renegadeforce.
Come the Conclave, organized mage resistance seems to have largely been driven to Western Ferelden. There the mages appear to have been in two remaining groups- the power-mad apostates who fell under a mage supremacist ideology, and the hundreds of mages who were granted shelter in Redcliffe (possibly to support the Conclave). At this point the Templars have a military advantage, garrisons available across Thedas, and there are no indications of any other free mage movements of rebel mages. However, the Ferelden Crown's shelter of the Circle mages in Ferelden means that, aside from the apostates at the Crossroads, any storm or seige of the remaining mages would mean an attack on a major Ferelden city.
So the Divine issues the Conclave, and representatives from both sides come. Tal-vashoth mercenaries, considered 'neutral' (and so unlikely to have been used much by either side), secure the area. Divine Justinia herself hosts.
What is interesting here is not so much who would attend, but who doesn't attend. Nearly all major clerics of good repute are there... leaving behind those who are compromised by dark pasts, too minor to merit attendance, or both. From the Templars the Knight Commanders are there, but the Seekers who led the rebellion are not- possibly in pursuit of the conspiracy, but possibly because the more moderate commanders who would compromise to some restitution of the Circle didn't think they should be there. Likewise on the Mage side, known radicals or extremists are not invited or present: Fiona, Grand Enchanter and architect of the rebellion is left behind for the negotiations of her own rebellion, while Vivienne, leader of the Loyalists and hardliner towards the rebels, is also a non-presence.
Conclave blows up, and everyone losses their A Team leadership. The Chantry pretty much reels until the end of DAI. The Lord Seeker (a part of Corypheus's conspiracy) steps into the void of the Templar chain of command, recalls all Templars, and takes them to Therienfeld to convert them for Red Templars. Fiona, the last surviving rebel Enchanter, resumes leadership and panics that the Templars may well be marching on her. The Renegade Templars and Mad Apostates, already rogue, continue to fight out in the Crossroads with the Templars having a fortified Keep and the Mages hiding a nearby forest.