During the Cologne War
(1583–89), Ferdinand of Bavaria
successfully besieged the medieval fortress of Godesberg; during a month-long siege, his sappers dug tunnels under the feldspar of the mountain and laid gunpowder and a 1500-pound bomb. The result was a spectacular explosion that sent chunks of the ramparts, the walls, the gates, and drawbridges into the air. His 500 men still could not take the fortress until they scaled the interior latrine system and climbed the mountain to enter through a hole in the chapel roof.