be puzzled

References in classic literature ?
If, on the other hand, they have the map, and see us digging at a spot not indicated on it, they will be puzzled, knowing we must have some idea of where the buried city lies.
One of them, whom I by no means thought the best, has given us a play, known to all the world, which I am almost ready to think with Zola is the greatest play of modern times; or if it is not so, I should be puzzled to name the modern drama that surpasses "La Morte Civile" of Paolo Giacometti.
This, however, I must own, had not a great deal to do with my liking him so much, and I should be puzzled to account for my passion, as much in his case as in most others.