In September 1935, Bliss served in the 48th Infantry Regiment of the Polish Army in Stanisławów (now Ivano-Frankivsk in western Ukraine).

Before the German invasion in USSR started in June 1941, Biss worked as a teacher in the Kołomyja area, where he also joined the Polish resistance.

[1] In November 1940, he started serving in the Union of Armed Struggle (ZWZ), a precursor of the Home Army, which he subsequently joined.

[citation needed] In the spring of 1944, Biss became a company commander in the 26th Infantry Regiment of the Home Army around the village of Siemianówka [uk] near Lwów.

Rąkowski writes that on July 26, 1944, troops commanded by Biss stopped an attack by the 14th Waffen Grenadier Division of the SS (Galicia).

[1] A few weeks after being disarmed, Biss was ordered by the Home Army command to reform his unit and march to assist the Warsaw Uprising.

[1] On March 3, 1945, Biss' unit carried out a massacre of Ukrainian civilians in the village of Pawłokoma, in today's Subcarpathian Voivodship, Poland.

However, in a September 4 hearing Biss admitted to have authored a February 6, 1945, report to the Lwów region Home Army commander in which, under the heading "liquidation", he described the execution of Communists on three different occasions.

After his release he started work at the bus station in Opole, where he renewed contact with Edward Cieśla, a former Home Army soldier he had met in prison.

In an October 23 robbery the same year, Biss and Cieśla, stole 110,000 PLZ from the register of the "Granit" government cooperative in Dzieszkowo.

On November 11, Biss's associates Żmura and Cieśla attempted to rob a government cooperative in Opole but were captured by the Milicja Obywatelska.