And so what? That doesn't make them outright victories for Tevinter. Hell, since Tevinter has never been able to expand southwards (ignoring a small little defection in the mid-Dragon Age) since then, the Marches can be said to have successfully prevented Tevinter designs on Southern Thedas.
As i remember it was a very long time ago when Tevinter wanted some of south lands, it was after 3 blight as i remember then they have took some city where they win archdeamon but later they abbandon it cos they have no use of it
And what actual reasons Tevinter have for expansion even if we forget that Qunari for hundreds of years are not stop to invade and die on their lands?
And in what lands they need to expand? Blighted desserts of Anderfels where Grey Wardens sits what they abbandon by themselfs sinse 1 blight or desert of Solassan or swamps of Antiva which Merchant Princess with their Felicima Armada already a puppets of magisters?
They lands as cities could hold much more peoples when it have now after 1000 years of wars and deaths cos of blights and wars, they have much better infrastructure and peoples who does not need to be teached to be Imperium citizens, there is no profit in this and just a waste of Imperium material as people resources, and time
What south lands could have what Tevinter need? low quality slaves?
As i rebember only Qunari are stupid to make attemps for expansion just for expension as Seekers Orlais Chantry was try to controll of Thedas minds