John, fired Gallagher carbine bullets in Arkansas are rare, so if you know who carried Gallagher carbines you've got your answer. No need to list the other units. I already knew all the other Union Cavalry units in this fight were armed with Sharps, Starr, and Cosmopolitan Carbines. The 9th Kansas Cavalry carried Gallagher carbines and were in this fight of which I knew nether before hand.