This small pamphlet was undoubtedly produced in the context of Crawley’s role as a member of the Corps of Royal Engineers and represents his description and record of the aboideau techniques still being used on the marsh in the mid-19th century. Crawley’s map and technical drawing, dated 1843, depicts the principal geographic features of the marsh from Fort Cumberland westward to the edge of the present-day Town of Sackville, which at the time had yet to emerge as the dominant commercial centre among the straggling settlements stretching along the upland ridge toward Upper Sackville.