The Roles and Weapons with the Squad

[Pete]

An U.S. army platoon dug in in a defensive position overnight sometime in 1944. It was on a forward slope ... when morning fog had cleared, a camouflaged assault gun began opening fire on the forward slope position, decimating the platoon.

At the risk of being another old f*rt who repeats himself, the following is from Paul Gorman in The Secret of Future Victories.

DePuy was at odds with both propensities, being convinced that field fortifications should primarily provide cover from frontal fire, and should be wholly concealed from the enemy. In 1973, in explaining to the Commandant of the Infantry School and the Combat Arms Training Board what he expected them to do, and why, he told of an incident toward the end of the Battle of the Bulge, in early February 1945, when his battalion had pushed forward toward the Belgian-German border against stiffening German resistance. One company had dug in one evening along the military crest of a high, open snow-covered ridge, the soldiers' exertions with their entrenching tools ringing each foxhole with "dark doughnuts in the snow." After dawn the next day, from a ridge facing them, the Germans opened fire with high velocity, pinpoint-accurate cannon, probably from Jagdpanzer. "It was murder":17

I do not believe that infantry can survive on the modem battlefield against a modem enemy if our positions can be seen by their side. The issue ... is field of fire, cover and concealment. The reason that I feel [so strongly] is because I just happened to see German tanks kill a lot of my soldiers.... (My battalion) dug in where they could be seen, and a couple of tanks on a hill opposite just picked them off one by one. They couldn't get out and run, couldn't get away. [The enemy] just walked his tank cannon right down that one company--C Company--[I had] a pretty awful, hopeless, and helpless feeling. They were dug in wrong. They could be seen ... the lesson I hoisted aboard back in World War II is still valid for today and the future.

DePuy taught his troops to employ rear slope defenses when they could, and to dig cover and concealment when they could not. His ideas did not always agree with concepts of contemporaries.18 DePuy tells of a clash with Army Training Test umpires when he was commanding 2d Battalion, 8th Infantry, in Germany in 1953. Because of his World War II experiences, DePuy had trained his battalion to dig defensive positions in such a way that they were wholly invisible from the front. Typically, a 2/8 Inf soldier would dig his foxhole directly behind a tree or a rock, or in the midst of a bush, with his field of fire across the front of adjacent holes similarly sited. Spoil was concealed, and great pains taken to maintain the "natural appearance" of the position as seen from the enemy perspective. Emplacements with extensive frontal views were reserved for indirect fire observers, or for accompanying tanks. Many of the Army Training Test umpires were veterans of Korea, and most were graduates of the Infantry School. They held that the 2/8 Infantry positions little resembled a proper defense. DePuy knew why:19

[In Korea] they built big forts. When you got out in front, you could see everything.... The umpires who came to test [2/8 Inf] thought I was crazy. They didn't understand why I hadn't built Korean pillboxes on the military crest or at the bottom of the hill. Instead I had my guys behind rocks, trees and bushes. I wouldn't let them disturb the bushes, so you couldn't see a thing from the front.... All the company and platoon umpires ran back to the battalion umpire and said, "This battalion is totally unsatisfactory. They don't know how to dig in." They were also sceptical about the overwatch and bounding [in the atack]....

(Fortuitously, it turned out the the Chief Umpire was a Colonel who had served in the 5th RTC in Korea, and who readily agreed with DePuy; the 2/8 Infantry passed its test.)

DePuy's field fortification techniques received a rigorous test in Vietnam. There his troops in the 1st Infantry Division were taught to erect a frontal parapet of earth constructed of spoil from the foxhole, camouflaged with vegetation, with partial overhead cover as well. In 1967, shortly after DePuy's departure from command of the Big Red One, 1st Battalion, 18th Infantry, dug in after that fashion, defeated an all-out attack by a regiment, with an enemy-to-friendly mortality ratio of 198 to 1.20.