It was a time of waiting, watching and wondering along the DMZ. In their foxholes and fortified villages, from behind hedgerows and under the cover of banana plantations, the tough troops of three North Vietnamese divisions the 324B, 325th and 610th were dug in and waiting, listening for the bugle calls that would order them south. On the Rockpile and the Razorback and scores of other hilltops from the South China Sea to the Laotian border, seven battalions of U.S. Marines, backed by eight South Vietnamese army battalions, were dug in and watching, wondering when the attack would come.
The...