Despite a call to arms and defense by the student cadet corps, only four buildings survived the burning: the President's Mansion (1841), Gorgas House (1829), Little Round House (1860), and Old Observatory (1844).[1] The university reopened in 1871 and in 1880, Congress granted the university 40,000 acres (162 km²) of coal land in partial compensation for $250,000 in war damages.[2]