When Babydoll (Emily Browning) and her four friends fight for their freedom in Zack Snyder’s Sucker Punch, one of the things they’ll be battling is a zombie army—and a just-released short is here that shows those zombies some love.

Here’s what The Trenches, animated by Ben Hibon, is all about:

In Sucker Punch, the girls face off against an army of mechanized WWI soldiers. Through the use of clockwork and steam technology, human soldiers who die in battle are reanimated and sent back to the front lines. Although seemingly indistinguishable and soulless, the zombie army is not just made of gears and steam, but also of human flesh, bone, and memory. In The Trenches there is a tragic tale behind each lifeless mask.

Sucker Punch will hit theaters on March 25.