Aerial photograph taken by the Signal Corps depicting an unidentified trench system during World War One. The image is part of the Maps and Charts NIMICE series, with protocol number 6221. The photograph was taken on March 10, 1921, and is used for reconnaissance purposes.

---

Size: 9181px × 6300px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 3-10-1921, 6221, activities, aeri, aerial, american, bu, charts, corps, identified, issued, maps, military, nimice, photograph, protographer, reco, signal, symbol, system, trench, war, world