I have a friend who served in Vietnam as a helicopter crew man/chief.
He was on a mission in Cambodia where the south Vietnamese were over run, they then broke rank and went into a full out every man for him self retreat.
He believes the Custer battlefield and what he saw in Cambodia was very similar.
That is how Captain Benteen described the Last Stand Hill area. "There was no line on the battle field; you can take a handful of corn and scatter it over the floor and make just such lines."
