In each of the two re-entrant angles on the western part of the Citadel trace, a group of six Napoleonic casemates provided both ditch defence and barracks, to a common design quite different from the Long Casemates. From the mid-19th century and probably from the Napoleonic period, these were referred to as the Left Wing and Right Wing Casemates. In 1858, they were called collectively the West Face Casemates. Each group comprised two sets of three casemates, with short passages for communication between the sets. (location accurate to the nearest 1m based on available information)