The 104th company was formed within the Home Army in 1943, on the basis of the combat unit of the Polish Syndicalists Union.

[citation needed] Also, it attacked the Polish Securities Printing House building, capturing it on the night of August 1/2.

After heavy fights in the first weeks of August 1944, the Company became the best-equipped Polish unit in the area of the Old Town.

In the second half of August, the Company created its headquarters in the so-called Professors’ House, at 12 Brzozowa Street, where it stayed until general retreat from the district.

[citation needed] In late August 1944 the company, numbering only around 100 soldiers, evacuated through the sewage canals to the Warszawa-Śródmieście (Warsaw city center).

In early September, parts of the company carried out rearguard actions during the evacuation of Warsaw’s Old Town.