June 6 is not only the date for D-Day, the last significant engagement in Arkansas occurred on this date in 1864. The following link will take you to an article on the engagement. Iowa troops from the 14th, 27th, 32nd and 35th Infantries were involved.
Encyclopedia of Arkansas
Location: Chicot County Campaign: Expedition to Lake Village Dates: June 6, 1864 Principal Commanders: Brigadier General A. J. Smith (US); Colonel Colton ...
encyclopediaofarkansas.net