Look up Milunka Savic. Fought in 1st and 2nd Balkan War and WW1 on the eastern front. She also got thrown into a concentration camp during WW2.I really enjoy history and studying but I know of no women that were front line troops in the trenches going over the top during WW1, especially on the western front. Maybe in the capacity of a hospital or such, or the eastern front for a short time there was a unit with the Russian Army and Finnish army during the 1918 Finish Civil war.