 When the Tet Offensive began , feelings ran high at MACV that the base was in for a serious attack . In I Corps , the Tet Truce had been cancelled in apprehension of a communist assault that never happened . The offensive passed Khe Sanh by and the intermittent battle continued . Westmoreland 's fixation upon the base continued even as the battle raged around him in Saigon . On 1 February , as the offensive reached its height , he wrote a memo for his staff — which was never delivered — claiming that " The enemy is attempting to confuse the issue ... I suspect he is also trying to draw everyone 's attention from the area of greatest threat , the northern part of I Corps . Let me caution everyone not to be confused . " 
