o expand his gains. But now that winter is approaching, the domestic situation in Liao could change at any time. He may not dare to risk entering the pass."But the stage is already set. If he doesn't...led letter, not very long.There is no lengthy treatise by Yelü Shenxuan inside.The whole passage only tells one story.When the former emperor, Emperor Tianyuan, sensed his time was drawing near, the p...