Why not hide in the woods, or even up in the Western Waste beyond the great waterfall and live like outlaws? And then they might gradually get stronger and stronger, for Talking Beasts and Archenlanders would be joining them every day. And at last they’d come out of hiding and sweep the Calormenes (who would have got careless by then) out of the country and Narnia would be revived. After all, something very like that had happened in the time of King Miraz!
And Tirian heard all this and thought “But what about Tash?” and felt in his bones that none of it was going to happen. But he didn‘t say so.