Typed caption on map: "Switch Trench in our hands. Saps being pushed forward and linked up, preparatory to a further advance. These photographs illustrate the importance of ascertaining the exact position of our troops."
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[Aerial view of European battlefield and accompanying map], [2005-06-08_image_077]. Museum of Flight Digital Collections, accessed 07/12/2025, https://digitalcollections.museumofflight.org/nodes/view/8384
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