The most successful South Vietnamese force had been the 7th Infantry Division, then under the command of Colonel Huỳnh Văn Cao. His US adviser was Lieutenant Colonel John Paul Vann, who directed much of the unit's activity in concert with his planner, Captain Richard Ziegler. They had scored the biggest successes of the military campaigns of 1962, killing along with the paramilitary and Civil Guard and Self Defense Corps, more than 2,000 VC fighters and leaving thousands of others cut off from supplies.