Battle in Wiltshire

A pamphlet dated (in MS.) Dec. 12. 1642, describes an engagement as taking place in Wiltshire between Rupert and Skippon. If this be so, how comes it to pass that not only the general histories are silent as to the event, but that even the newspapers omit it? We know that Rupert was at the sack of Cirencester, in February, 1642-3; and Cirencester is on the borders of Wiltshire: but is there any authority for the first-mentioned visit to this county, during the period from the affair at Brentford to the taking of Cirencester?