What battle enabled the union to capture Richmond?

The Battle of Richmond, fought on August 29-30, 1862, allowed Union forces to gain a significant advantage over the Confederate army, but it was actually the culmination of multiple battles and campaigns, particularly the Siege of Petersburg (June 1864 - April 1865), that ultimately enabled the Union to capture Richmond. The successful Union assault and the eventual fall of Petersburg in early April 1865 directly led to the abandonment of Richmond by Confederate forces. Consequently, the capture of Richmond on April 3, 1865, marked a pivotal moment in the Civil War, signaling the impending defeat of the Confederacy.