The Last of the Barons, Book X by Edward Bulwer-lytton

All in the chambers of the metropolitan fortress exhibited the greatest confusion and dismay. The sentinels, it is true, were still at their posts, men-at-arms at the outworks, the bombards were loaded, the flag of Edward IV. still waved aloft from the battlements; but the officers of the fortress and the captains of its soldiery were, some assembled in the old hall, pale with fear, and wrangling with each other; some had fled, none knew whither; some had gone avowedly and openly to join the invading army.

Through this tumultuous and feeble force, Nicholas Alwyn was conducted by a single faithful servitor of the queen's (by whom he was expected); and one glance of his quick eye, as he passed along, convinced him of the justice of his counsels. He arrived at last, by a long and winding stair, at one of the loftiest chambers, in one of the loftiest towers, usually appropriated to the subordinate officers of the household.