A Lakota attack on a U.S. Army tent bivouac. This undoubtedly occurred during the late-summer of 1865, and the enemies are soldiers of General Patrick Connor's Powder River Expedition. Sitting Bull crawls within arrow range of one of Connor's Parrott guns, while two teams of artillerymen lob exploding case shells into the Lakota positions. A close review of the Army reports ought to pinpoint the exact occasion and date.