I have not found any Union general directing file closers to shoot men for straggling. I am not sure such does not exist. I have found no US Army counterpart to Lee’s Gen Order number 4 with its circular.
I can believe that. I would not have wanted to be in one of Jackson's Corps forced marches, heck every one of his marches were probably forced i.e. > 15 miles and file closers taking up the rear in but in front of the baggage train.
From what I have read it was a good day when a regiment was reassigned out of Jackson's Corps. Celebrating was in order ....