Severly eroded walls of Battery St. Louis
Battery St. Louis is located on the southern end of Concordia Bay, above Compagnie Bay. Compagnie Bay is not suited at all for troop landings, nor does it have any desirous anchorage. St. Louis' sole function at this point was apparently to provide cross-fire for Battery Concordia to the north, and Battery Corre Corre to the south.
Ships passing the battery could feasibly come in rather close to shore at this point, but would have little reason to do so, for the water is extremely rough, there are no safe landings, and the bay is circumscribed by sheer cliff walls.
The battery itself is situated some 90 feet above the shoreline, and would be able to rake a devastating fire from above on any ships attempting to anchor in this bay, while enjoying a good protection from return fire due to their elevation. The cliff in front of the battery would also offer little in the way of assitance to the ship's gunners, for there is no appreciable slope in front of the battery up which shot could be ricocheted.
Battery St. Louis was extremely disturbned by erosion. None-the-less, it can be seen as yet another example of the three-winged, open coastal battery so typical of the island defenses. Its walls were of mortared cobble, with exposed stone placed so as to present a faced appearance. The interior floor was cobble paved.
The fallen walls of St. Louis measure some 2.4 feet thick and 2.9 feet high. Because of the erosion at the site, it could not be determined if a soil embankment was provided this battery as at Battery Concordia, but it is likely considering the other similarites. The remains suggest an interior wall height of 2.5 feet, however, which would be nearing the maximum height allowable for a parapet made without embrasures. This height would negate the possibility of negative angle firing, but as the bay did not need such protetion, this would not be a concern.
Archaeological survey of the battery defined an area to the south with a dense artifact scatter, which probably relates to the garrison. No cannon remained at St. Louis.
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