§Subterranean shells, a recent
war invention, were much discussed by the Union
forces at Blakely.
§The torpedoes consisted of explosive 12 and
24 pound cannon balls with a pressure triggering device.
§The torpedoes were
concentrated between the Union rifle pits and their main
trench.§The shells were
planted before the siege and the Union troops had to be careful of
them during the assault on Fort Blakely.
§See The Battle of Fair Oaks, Virginia Scientist Pagefor a good
explanation of torpedoes.