Mieczysław Mikołaj Słaby ( December 9, 1905 in Przemyśl, March 15, 1948 in Krakow)[1]– was an officer and medic in the Polish Army during the Invasion of Poland, notably during the Battle of Westerplatte.

He was one of the children of Józef Słaby, a railway worker, and Agnieszka née Rebizant, along with his brother, Franciszek, who later became an NCO in the Polish Army.

In addition, the ordered medical equipment (such as an operating table) was requisitioned by the customs authorities of the Free City of Danzig just before the German aggression against Poland.

While in the army, he also treated civilian patients, became a doctor at the School of Economics and, in his free time, he helped the medical team at the nearby hospital.

For almost a month, he was detained in Przemyśl, and then secretly deported to Krakow where he was imprisoned in the Montelupich Prison[3] where he was subjected to a brutal investigation and deprived of medical care, despite the advanced condition of his ulcer.