These two armies are in war in Legend of dragon series between parts 1-10, Eveliina is stormtrooper captain and Iron Skull/Johann Schmidt is leader of HYDRA. This was made june 22, 2017.
Redraw: https://www.weasyl.com/~rathaloshunter16/submissions/1895291/stormtroopers-vs-hydra-redraw
Archive of Our Own story: https://archiveofourown.org/works/10877907