The Polish Army in France WW1 - Haller's Army - They fought for their family. They fought for their ancestors. They fought for their freedom. Most of all they fought for their homeland - Poland. "They" were known by a few different names - - The Haller Army, the Blue Army (Błękitna Armia), and also as the Polish Legion in France. This Blue Army (they wore horizon blue French uniforms) was the Polish contribution to the forces on the western front in WWI.