That's really high quality for literal potato photography.
(Context: The autochrome used starch particles from potatoes - some dyed red, others green, others blue - over the photosensitive layer on a glass photography plate as a color mask that was used both for filtering incoming light as the photo was taken, and for producing appropriate colors when viewing. The images needed to be shown backlit at high intensity, and neither color reproduction nor sharpness was very good. Starch was cheaper than three times as much photosensitive material, though.)
this is how it was prior to machine guns and tanks
Unless OP typo'd the year in the title and this wasn't actually from 1913, Gatling guns had existed for almost half a century and the British Mark I tank was only 3 years away.
To be fair, Europe had spent most of the time the Gatling and Maxim had existed for fighting under the rules of engagement, as the great British Captain Blackadder once noted, that the "prerequisite of a... campaign was that the enemy should under no circumstances carry guns."
This is a year before the start of WW1, so that's likely precisely what happened. The start of the great war completely changed tactics and overall military doctrine. At the beginning, officers would often command cavalry charges against machine gun fire, with expected results
