What about the Franco-Prussian War https://en.wikipedia.org/wiki/Franco-Prussian_War https://en.wikipedia.org/wiki/Franco-Prussian_War from 1870-1871. Between

What about the Franco-Prussian War https://en.wikipedia.org/wiki/Franco-Prussian_War https://en.wikipedia.org/wiki/Franco-Prussian_War from 1870-1871. Between France and Germany, over 3 million soldiers were deployed and 44,000 Germans and 138,000 French soldiers died. There was also the Crimean War https://en.wikipedia.org/wiki/Crimean_War https://en.wikipedia.org/wiki/Crimean_War from 1853-1856, in which all sides mobilized over a million soldiers and suffered 750,000 losses and casualties (including deaths from disease). Finally, although not in Europe, the American Civil War of 1861-1865 was a foretaste of what industrialize warfare looked like with artillery, trenches, railroads and telegraphs, as well as the deliberate destruction of civilian infrastructure as a way to destroy the enemies' ability to continue to wage a war.