 This reflected the global trend to simplify the appearance of fortifications, as outlined in the 1880s, in connection with the transition to a new building material – concrete.The 1900-1904 concrete casemate construction has elements of civil architecture - cornices, window frames, due to its small size, commensurate with a one-story building.For the 1910–1915 construction, arrays are concrete, the facades of which formed large, carefully decorated planes.