UPDATE: This photo appears in the September 27, 1943, issue of Life Magazine. It was the magazines’ “picture of the week” (pages 36/37) https://books.google.com/books?id=YFAEAAAAMBAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false … it’s described as an ACME Telephoto; no photograph name is associated with it.

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Bruce provided me a copy of this pic.  That’s a pretty intimidating sign.

The sign reads:

KILL THE BASTARDS!
Down this road marched one of the regiments of the united states army
Knights serving the Queen of battles
Twenty of their wounded in litters were bayoneted, shot and clubbed by the yellow bellies
KILL THE BASTARDS!