Web Author's Notes:
This map (north to left)) shows the location of troops at the brigade level during Grant's first assault Vicksburg on May 19, 1863. The red star shows the approximate position of the 16th Ohio under Col. Daniel W. Lindsey's 2nd Brigade under Gen. Peter J. Osterhaus' Ninth Division, commanded by Maj. Gen. John A. McClernand of the 13th Corps under Gen. Ulysses S. Grant.

Map from National Park Service.