Dr Mackellar and Red Cross staff crossing the Morava river after the Battle before Alexinatz, Serbia. Wood engraving by G.… https://www.rawpixel.com/image/13961407/image-horse-person-crossFree Image from public domain licenseSerbo-Turkish War: English surgeons going with ambulances to the Battle of Alexinatz. Wood engraving, 1876. https://www.rawpixel.com/image/13987903/image-horse-person-artFree Image from public domain license