Born in Baden, German Federation in 1834, Adolph Metzner migrated to America in 1856 ...and raised a company of Turner Society members at Indianapolis (which became Company A of the 32nd Indiana Infantry) Colonel August Willich, commanding. Attached to Army of the Ohio after muster in August 1861, the 32nd Indiana occupied Bowing Green, Kentucky in February 1862 ...stopped briefly in Nashville ...and joined the march south and west to Pittsburg Landing to reinforce U.S. Grant. Reaching the west side of the Tennessee River morning of April 7th, Colonel Willich led his men into a gap between W.T. Sherman and Lew Wallace (and gained the admiration of General Wallace for the gallant conduct of the regiment under fire.)
But, most importantly for our purposes: Lieutenant Metzner was a sketch artist, working in pencil of various colors.
August Willich at Green River, Kentucky 1862 [by Adolph Metzner]
Everywhere the 32nd Indiana went, Metzner managed a sketch (and usually provided a date for the image):
"Duck River Bridge at Columbia, March 21st 1862" [important because it shows condition of bridge that delayed Buell and apparent depth of the river.] Also, the other places marched through, and dates, are recorded.
As concerns Shiloh, the only images I have encountered (of which there are three) are titled "Casualties." Adolph Metzner must have been astounded by the horror of Pittsburg Landing, as it presented to him: the images are gruesome and graphic.
The 32nd Indiana joined Halleck's Crawl to Corinth: Metzner sketched scenes enroute, and ten or more in vicinity of Corinth. In addition, the artist sketched numerous images of soldiers and officers of the 32nd Indiana; sketched W.T. Sherman and U.S. Grant; and reproduced scenes from Chattanooga and Atlanta. In all, the Library of Congress holds over 120 sketches Metzner created during 1861-65 (and a further 70 CDVs that are only accessible at the Library.)
Adolph Metzner survived the war, and lived out his life in New Jersey. Upon his death in 1918, his body was returned to Indianapolis for burial.
References: http://www.loc.gov/search/?fa=contributor%3Ametzner%2C+adolph&sp=1 Metzner Collection at LOC
http://en.wikipedia.org/wiki/Adolph_G._Metzner Metzner bio at wikipedia
http://32ndindianainfantry.yolasite.com/ 32nd Indiana history (includes CDV of Adolph Metzner)