There is no archaelogical evidence of a forr, and the town was encircled with earthen defenisve walls in the first century, but they were leveled in the third.
http://roman-britain.co.uk/places/caesaromagus.htm
http://www2.rgzm.de/transformation/unitedkingdom/smalltowns/Img43.htm
http://www2.rgzm.de/transformation/unitedkingdom/smalltowns/smalltowns_englisch.htm
