An essay on fortification: or, An enquiry into the causes of the great superiority of the attach over the defence. Into the means of determining the disposition and construction of the works by the operations of the attack. Into the changes this observation has produced in the method of fortifying. And, Into the advantages which may be drawn from it, for the defence. With a supplement, containing Marshall Sace's New system of fortification, and construction of wooden forts. The whole illustrated with sixteen copper plates. From the French [,] / By Captain Charles Vallancey ...