Stefan de Walden was a Polish

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 military commander and engineer.

He participated in the fights of the Riverine Flotilla of the Polish Navy

Riverine Flotilla of the Polish Navy

The Riverine Flotilla of the Polish Navy , better known as the Pinsk Flotilla, was the inland branch of the Polish Navy operating on the Vistula river and in the area of the Pinsk Marshes between the Polish-Bolshevik War and World War II...

 during the Polish-Bolshevik War. During the Polish Defensive War

Invasion of Poland (1939)

The Invasion of Poland, also known as the September Campaign or 1939 Defensive War in Poland and the Poland Campaign in Germany, was an invasion of Poland by Germany, the Soviet Union, and a small Slovak contingent that marked the start of World War II in Europe...

 of 1939, he served as the commanding officer of Wicher, one of the destroyers of the Polish Navy

Polish Navy

The Marynarka Wojenna Rzeczypospolitej Polskiej - MW RP Polish Navy, is the branch of Republic of Poland Armed Forces responsible for naval operations...

 to take part in the Battle of the Gdańsk Bay

Battle of the Gdansk Bay

The Battle of the Danzig Bay took place on September 1, 1939, at the beginning of the invasion of Poland, when Polish Navy vessels were attacked by German Luftwaffe aircraft in Gdańsk Bay...

. After the war, since 1947, he headed the Historical Detachment of the Naval Staff of Poland.