An early period (Agricolan ?) Vexillation fort that was in Flavian times reduced in size, but seemingly utiliizing the same north wall.
http://canmore.rcahms.gov.uk/en/site/65920/details/dalswinton+bankfoot/
http://roman-britain.co.uk/places/dalswinton.htm
http://www.euppublishing.com/doi/pdfplus/10.3366/gas.1976.4.4.1