A large prisoner-of-war (POW) camp was built at Portadown during World War II. It was at the site of a former sports facility on what was then the western edge of town. This area is now covered by housing from Fitzroy Street and the Brownstown Estates. The camp housed (mostly) German POWs. For a time these POWs were guarded by Welsh servicemen who had been transferred from Germany (known as "Bluecaps") and who were billeted at St Patrick's Hall in Thomas Street. Many of the Welsh soldiers chose to be demobilised to Portadown as they had formed relationships there.