However, continued my uncle _Toby_, to make them sure, we generally choose to place ravelins before them, taking care only to extend them beyond the foss or ditch: ----The common men, who know very little of fortification, confound the ravelin and the half-moon together, --tho' they are very different things; --not in their figure or construction, for we make them exactly alike, in all points; --for they always consist of two faces, making a salient angle, with the gorges, not straight, but in form of a crescent: ----Where then lies the difference? 
'However,' continued my uncle Toby, 'to make them sure, we generally place ravelins before them, taking care only to extend them beyond the foss or ditch. - Men who know little of fortification, confound the ravelin and the half-moon, though they are very different things; - not in their construction, for we make them exactly alike; for they always consist of two faces, making a salient angle with the gorges, not straight, but in a crescent.'
'Where then lies the difference?' 