Statistics for occurrence #1 of “Commander R. N. Stembel” in chapter 16 of Admiral David D. Porter, The Naval History of the Civil War.:

...ceeded down the river towards Columbus. Besides the flag-ship Benton, there were the Mound City, Commander A. H. Kilty; Louisville, Commander B. M. Dove; Carondelet, Commander H. Walke; Cincinnati, Commander R. N. Stembel ; St. Louis, Lieut.-Commanding L. Paulding; Pittsburgh, Lieut.-Commanding E. Thompson; Lexington, Lieut.-Commanding J. W. Shirk, with four transports, each having five mortar-boats in tow; also a maga...
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