President Lincoln, Allan Pinkerton, and Maj. Gen. John A. McCleland. Original public domain image from Flickr https://www.rawpixel.com/image/8799525/photo-image-plant-art-treeFree Image from public domain licenseVrishaketu and Bhima Fighting Yavanatha, Scene from the Story of Babhruvahana, Folio from a Mahabharata ([War of the] Great… https://www.rawpixel.com/image/11932014/image-arrows-face-personFree Image from public domain licenseThe Battle of Gettysburg, Pa., July 3rd, 1863, publisher Currier & Ives https://www.rawpixel.com/image/9183877/the-battle-gettysburg-pa-july-3rd-1863Free Image from public domain licenseHudibras and the Skimmington, plate seven from Hudibras by William Hogarth https://www.rawpixel.com/image/8979049/hudibras-and-the-skimmington-plate-seven-from-hudibras-william-hogarthFree Image from public domain licenseMemorial Number (ca. 1890–1907) print in high resolution by Edward Penfield. Original from The New York Public… https://www.rawpixel.com/image/3007803/free-illustration-image-vintage-poster-civil-warFree Image from public domain licenseNew York State Soldiers' Depot, New York City: the hospital. Colour lithograph, 1864. https://www.rawpixel.com/image/13951105/image-person-art-hospitalFree Image from public domain licenseA large cannon pushed forwards by Furies crushes American soldiers under its wheels; representing the American Civil War.… https://www.rawpixel.com/image/13958230/image-paper-person-artFree Image from public domain licenseNew York State Soldiers' Depot, New York City: wash and bath room. Colour lithograph, 1864. https://www.rawpixel.com/image/13954118/image-person-art-clothingFree Image from public domain licenseFranco-Prussian War: Civil unrest in Paris. Wood engraving after W. Simpson. https://www.rawpixel.com/image/14019305/franco-prussian-war-civil-unrest-paris-wood-engraving-after-simpsonFree Image from public domain licenseThe execution of a deserter in the Federal Camp, Alexandria, during the Civil War in America. Wood engraving. https://www.rawpixel.com/image/14020594/image-person-art-baseballFree Image from public domain licensePlate LIV. Results of resections at the elbow for shot injury. American Civil War (1861-65). https://www.rawpixel.com/image/13994155/image-face-person-artFree Image from public domain licensePlate XVII. Results of excisions of the head of the humerus. American Civil War (1861-65). https://www.rawpixel.com/image/14019883/image-cartoon-face-personFree Image from public domain licenseReturn of wounded Confederate prisoners, under a flag of truce, during the American Civil War. Wood engraving. https://www.rawpixel.com/image/13977326/image-person-medicine-artFree Image from public domain licensePlate XIII. Results of excisions of the head of the humerus. American Civil War (1861-65). https://www.rawpixel.com/image/13978228/image-cartoon-face-personFree Image from public domain licensePlate XVIII. Results of excisions of the head of the humerus. American Civil War (1861-65). https://www.rawpixel.com/image/14015461/image-cartoon-face-personFree Image from public domain license