On the afternoon of March 25, 1865 at the Battle of Jones's Farm, the II Corps (Second Corps) and VI Corps (Sixth Corps) captured Confederate picket lines near Armstrong's Mill which extended the left end of the Union line about closer to the Confederate fortifications. This put the VI Corps within about of the Confederate line. After the Confederate defeats at Fort Stedman and Jones's Farm, Lee knew that Grant soon would move against the only remaining Confederate supply lines to Petersburg, the South Side Railroad and the Boydton Plank Road, and possibly cut off all routes of retreat from Richmond and Petersburg.