On June 15, 1864, after seizing Battery 5, Union troops swept southward along the Dimmock Line. Men of the 1st and 22nd Colored Troops captured Battery 8, overcoming heavy resistance from part of Brig. Gen. Henry A. Wise's Virginia brigade. By the morning of June 16, the 1.5 miles of Confederate works between Batteries 3 and 11 were in Union hands.
After capturing this section of the Dimmock Line, the Federals incorporated parts of it, including Battery 8, into a second line of siege works. Battery 8 would see combat only one more time, when Union guns here helped repel the Confederate breakthrough at Fort Stedman in March 1865.