This episode happened sometime when I was in Tuy Hoa area when I was 22. My unit was urgently dispatched to the edge of Mt. Cai during the wee hours. We knew that  the Vietcong would come down to a town via this area for provisions. My unit ambushed in a line. The tropical heat was so oppressive that we felt like we were steamed in a cooker. All day long, we had to lie on our stomachs in ambush, taking aim with a rifle in the scorching heat.