The Army still retained a military presence on the island, and in the 1830s, it constructed several new buildings, such as officers' barracks and a hospital. The Army also added masonry seawalls and opened an "administrative and training center" starting from the 1850s. The erection of the recruiting center and barracks resulted in the creation of Nolan Park, to the east for Fort Columbus. Together with these changes, a grassy area was cleared between Fort Columbus and Castle Williams to allow better vantage points should defensive attacks be launched. Other Army structures included a muster station that operated throughout the Mexican–American War and American Civil War, as well as a music school. Still, most of the troops continued to live in tents. To accommodate Army personnel's religious requirements, a small Gothic Revival chapel for Protestants was built on Governors Island in 1846.