Strike to win, strike only when success is certain;
if it is not, then don't strike.
General Vo Nguyen Giap
The tangled jungle scrub of Cu Chi lies only 20 miles northwest of Saigon. For nearly two decades it has been the impregnable preserve of the Viet Cong until one bright sunny morning when unexpected guests arrive. They are some 80 Armored Personnel Carriers of the U.S. 25th Infantry Division. Crashing through thickets, the APCs weave and crisscross, stitching the jungle with lethal, preplotted patterns of .50-cal. and M60 machine-gun fire. Grudgingly...