Caspian says nothing to that--what could he say? That his own shield at home was a golden lion rampant, and that the banner waving from the tip of the Dawn Treader's mast might as well be the same as that she had just described to him?

"By the Lion, I hope that he returns soon."

The words might not even reach Marian's ear, spoken as they are out towards the land around them. He rides Sorely up to Marian's side and they stay there, riding together down the road.