after Prince Frederick, Duke of York and Albany. At this time, the population was 702. In 1848, the first parish church of St. Michael, Yorktown was built by Henry Woodyer, in an area formerly part of Frimley, itself only a chapelry of Ash. Later, the Staff College was established to the east of the academy, and a property speculator built the nearby Cambridge Hotel. The surrounding area became known as Cambridge Town, but was renamed "Camberley" in January 1877 to avoid confusion by the General Post Office with Cambridge in Cambridgeshire. The name was actually derived from the "Cam" stream which runs through the town (mainly underground), "Amber" Hill which was marked on John Norden's map of the area in 1607 and "ley" usually meaning a clearing in the woodland. During the 19th century, Camberley grew in size. This was given added impetus with the arrival of the branch-line railway and railway station in 1878 and a reputation for healthy air, due to the vast number of pine trees, which were said to be good for those suffering from pulmonary disorders. By the end of the century the population had reached 8,400. Since then, the town has absorbed the original settlement of Yorktown, which is now regarded as part of Camberley. 20th century The Southern Scott Scramble, the first known motorcycle scrambling event, took place on Camberley Heath on 29 March 1924. The event, won by A.B. Sparks, attracted a crowd in the thousands and is considered to be the first instance of what later developed in the sport of motocross. During the Second World War, the Old Dean common was used as an instruction camp of the Free French Forces. The Kremer prize was conceived in the Cambridge Hotel in Camberley in 1959 after Henry Kremer toured a Microcell factory. The defunct Barossa Golf Club, on Barossa Common, was founded in 1893 and continued until the Second World War. The Old Dean housing estate was built in the 1950s on the "Old Dean Common" for residents of heavily bombed Surrey-area's homeless after World War II. Many of the roads on that half of the Old Dean are named after areas of London, with the others named after places on the common. Camberley falls under the siren test area of Broadmoor Hospital, a secure mental hospital in nearby Crowthorne. The siren was installed following a public outcry at the escape