Lets see a link. I know of a possible few anecdotal example of individual soldiers showing the flag on branches and such temporarily. I could find no unit that flew it into a battle and hence, fought under it. But maybe you have a source.your thread title is a lie.
you claim to be discussing the history of the flag, but you discuss it's beginning and then jump forward almost one hundred years.
how could you jump over it's use by southern units in WWII?
that was a huge part of it's development from a historical battle flag to a symbol of the south.
wikepedia has some stuff on it.