The Battle of the Crater took place outside Petersburg, Virginia. Union troops set off a tremendous mine underneath a stronghold in the Confederate lines. Among the soldiers charging into the resulting crater were Company K, 37th Wisconsin Infantry (composed partly of Menominee Indians) and Wisconsin’s only black unit, Company F, 29th U.S. Colored Troops. Delayed by bungling commanders, they were trapped in the crater, exposed to crossfire from Confederate soldiers, and cut down mercilessly. Read in our Civil War digital collection.