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Hi slippy!

Deguerre's style (and process) of very grainy, very slow "chemical" photography had been largely superceded by the mid 1850's by the wet-plate method, shuttered camera's, and removeable (glass plate) "negatives" that could be exposed and developed rapidly.

So, by the Civil War, traveling cameramen in horse-drawn wagons for the Eastern and Northern newspapers were regularly photographing the battlefields and soldiers.

Still took several seconds of exposure (so all the Civil War shots ou are either posed "pre-battle souveniers" for the family if somebody got killed. campfire posings of a geneal or his staff, or post-battle dead - cassuse they didn't move much either.

No "live" shots, even ships moved too fast to be photographed.

George Eastman, after the war, finally figured out how to print on "paper" from cheap cameras you returned to him for developing, and then later, invented the celuloid (flexible plastic) negatives we still use.