Post Hospital. In March 1868, Captain William Alonzo Wainwright arrived in Brownsville to supervise the rebuilding of Fort Brown following the Civil War and an 1867 hurricane. One of the first structures built under his direction was the Post Hospital, completed in 1869 and noted for its classical design and Palladian influences. First Lt. William C. Gorgas began studies that led to the discovery of the source of yellow fever while he was based here in 1883. #4086