The 1890s were devoid of large scale warfare between peer competitors. The wars that did occur were usually colonial ones or short wars with one side having a significant advantage at the outset (Greco-Turkish, Sino-Japanese).
The 1890s also occupies a strange place in world technology, when many of the technologies that made World War 1 so deadly were nonexistant or just in their experimental stage, such as the machine gun, the combustion engine and automobile, the submarine, the aircraft, poison gas, indirect artillery fire, flamethowers, and more.
What would a great power war look like in the 1890s, such as a renewed Franco-German War or Russo-German War? Would it look more like the Civil War or Franco-Prussian War, with armies still fighting set-piece engagements (on a scale never before seen) and individual campaigns, or more like World War 1, with warfare occurring along an entire front instead of just around an advancing army?