During the early stages of the siege, Ricketts continued in command of his battery with II Corps. This included a role supporting BG Gershom Mott's division in the Second Battle of Deep Bottom. After returning to the Petersburg front, the battery was assigned to positions near the Jerusalem Plank Road. During this period, Capt. Ricketts presided over a court of inquiry into the loss of a gun at the Second Battle of Ream's Station. He also served on a board deciding which units could add the names of particular battles to their flags. In December 1864, Ricketts, as "acting major," commanded the II Corps batteries serving on the lines of IX Corps for a period of three weeks.