Started the day with a visit to Brougham hall. A 14th century fortified hall with gatehouse and curtain wall. Partially demolished in the 1930s it was bought in 1968 by a couple determined to save it. Since then there has been a long and slow restoration project funded by private donations. It was free to look around so I bought some food from the tearooms and left a small donation.
Originally the site of a Roman observation tower for the nearby Roman fort Brocavum which is in the grounds of Brougham castle.
There was a pre Norman conquest Saxon fort on the site and then a Norman wooden fort before the 13th century gatehouse was built.
The Hall was close to the scene of a bloody battle between the Jacobite army of Prince Charles Edward Stuart and Government forces (the Clifton Moor Skirmish), that took place in December 1745.
Between 1941 and 1944 there was a secret tank development facility at Brougham Hall. The project was known as Canal Defence Light (CDL).
It was based upon the use of a powerful carbon-arc searchlight mounted on a tank. It was intended to be used during night-time attacks, when the light would allow enemy positions to be targeted. A secondary use of the light would be to dazzle and disorient enemy troops, making it harder for them to return fire accurately. The name Canal Defence Light was used to conceal the device's true purpose. For the same reason, in US service they were designated T10 Shop Tractor
https://en.wikipedia.org/wiki/Canal_Defence_Light

A CDL turret fitted to a M3 Grant tank; the CDL turret is fitted with a dummy gun