From that previous blog entry regarding the North Vietnamese sapper and his training::
"We learned how to crouch while walking, how to crawl, how to move silently through mud and water, how to walk through dry leaves." - - NVA sapper,.
AUSTRALIAN SAS TROOPS ON SURREPTITIOUS PATROL DURING THE SECOND INDO-CHINA WAR FINDING CONDITIONS DURING THE DRY SEASON DIFFICULT AT BEST.
"The seasons in Vietnam often had a huge impact on how fast a patrol could move without being seen or heard. In the dry season the vegetation thins and is left to dry and rout on the ground . . . Many patrol members hated patrolling in the dry season"
"'The problem with the dry, and in places it was exacerbated by the Americans defoliating some areas, was that we could see far greater distance s which meant that we could also be seen from the greater distances. In addition to that, because of the very dryness of the leaves and twigs on the ground in some areas where we might have had reasonable cover from view, we could be heard moving over long distance. It was like walking on corn flakes. To get a feel for it, you need to spread a packet of Kellogg's Corn Flakes onto a pavement and then try sneaking over them without making any noise.'"
Difficult to do at best. Walking quietly while on patrol with dried leaves and twigs underfoot being crushed making a distinctive sound not conducive to stealth!
BUT THE VIETNAMESE COMMUNIST SAPPER KNEW HOW TO WALK ACROSS DRY LEAVES AND TWIGS SILENTLY!