German field bakery on march - Glass negative photogrpah. Public domain.

Photograph shows a German field bakery with soldiers marching during the Winter Battle of the Masurian Lakes in 1915 on the Eastern Front during World War I. (Source: Flickr Commons project, 2016)
Title from data provided by the Bain News Service on the negative.
Photograph published in: Der krieg 1914/15 in wort und bild, Heft 23, p. 179.
On piece: "Winterschlacht in Masuren - Feldbackerei auf dem March". Translation: Winter battle in Masuren - Field Bakery on the march.
Photograph by Alfred Kühlewindt who was allowed to enter the battlefield as a war photographer in the fall of 1914. (Source: Flickr Commons project, 2016)
Forms part of: George Grantham Bain Collection (Library of Congress).
General information about the George Grantham Bain Collection is available at http://hdl.loc.gov/loc.pnp/pp.ggbain