 That night the VC assaulted the base several times more, but on each occasion they were repelled by artillery fire and close air-support.By September, the scale of VC and PAVN activities in III Corps had perplexed the U.S. commanders of Military Assistance Command, Vietnam.In the meantime, however, Hay decided to put an end to large-scale operations which had proven to be unproductive, until the enemy's real intentions were known.