Henry Clay Pleasants (February 16, 1833 - March 26, 1880) was a coal mining engineer and a brigadier general in the Union Army during the American Civil War. He is best known for organizing the building of an underground tunnel filled with explosives under the Confederate lines outside Petersburg, Virginia, resulting in the Battle of the Crater on July 30, 1864, an opportunity for Union troops to break the defense of Petersburg. Wikipedia
The definitive Wikipedia entry for Henry Pleasants. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Henry_Pleasants
