https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13961407
Dr Mackellar and Red Cross staff crossing the Morava river after the Battle before Alexinatz, Serbia. Wood engraving by G. Durand.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use