Battle of Lwów
1939 CE.
Shown on the map at 49.842°, 24.032°.
The Battle of Lwów (sometimes called the Siege of Lwów) was a World War II battle for the control over the formerly Polish city of Lwów (now Lviv, Ukraine) between the Polish Army and the invading Wehrmacht and the Red Army. The city was seen as the key to the so-called Romanian Bridgehead and was defended at all costs.
Text from the Wikipedia article Battle of Lwów (1939), licensed CC BY-SA 4.0.