"Paul Clifford", Chapter 26, by Edward Bulwer-Lytton

The rogues were very merry on their booty. They said a thousand things that showed the wickedness of their morals.--Gil Blas.

They fixed on a spot where they made a cave, which was large enough to receive them and their horses. This cave was inclosed within a sort of thicket of bushes and brambles. From this station they used to issue, etc.--Memoirs of Richard Turpin.

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A footnote from the author informs us that Harry Cook was a noted highwayman

arras: a rich tapestry, typically hung on the walls of a room or used to conceal an alcove

The picture used is of Turpin as he concealed himself in a cave on Epping Forest.

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