In late September, Grant planned another dual offensive. Historians sometimes enumerate Grant's offensives during the Richmond–Petersburg Campaign. Richard J. Sommers, John Horn, and Noah Andre Trudeau call these operations "Grant's Fifth Offensive". Grant's primary objective was to cut the railroad supply lines to the south of Petersburg, which would likely cause the fall of both Petersburg and Richmond. He planned to use a cavalry division under Brig. Gen. David McM. Gregg and four infantry divisions from the V and IX Corps of the Army of the Potomac to sever the South Side Railroad, an operation that would result in the Battle of Peebles' Farm from September 30 to October 2. Once again hoping to distract Robert E. Lee and draw Confederate troops north of the river, Grant ordered the Army of the James under Maj. Gen. Benjamin F. Butler to attack toward Richmond.