August 14, 1864 – Federal forces moved north of the James River to attack the supposedly weakened Confederate defenses outside Richmond. Federal siege operations resumed
July 30, 1864 – An ill-fated plan to detonate gunpowder under the Confederate trenches at Petersburg, Virginia, resulted in a disastrous Federal defeat. As Federals
July 29, 1864 – The final preparations were made to detonate gunpowder in a tunnel below the Confederate lines at Petersburg. By this time, the
June 25, 1864 – A Federal colonel proposed opening a gap in the Confederate siege lines by digging a tunnel under them and detonating explosives.
June 18, 1864 – Federal forces launched yet another assault on the Petersburg defenses, but by this time General Robert E. Lee’s Confederate Army of
June 17, 1864 – Federal forces from the Armies of the Potomac and the James launched another assault on Petersburg’s eastern defenses, as General Robert