Web Author's Notes:
This map shows good detail on the location of the different organizations and units at Vicksburg during the Second Assault. The 16th Ohio was near the southern end of the Union assault line under Col. Daniel Lindsey's 2nd Brigade under Gen. Peter Osterhaus' Ninth Division reporting to Maj. Gen. Edward Ord, commander of the 13th Army Corps.

Map by Hal Jespersen and obtained from Wikipedia.