Siege of Maastricht
1673 CE.
Shown on the map at 50.850°, 5.683°.
The Siege of Maastricht, 13 to 30 June 1673, took place during the Franco-Dutch War, when a French army captured the strategic Dutch fortress of Maastricht on the Meuse river. Siege operations were was conducted by Vauban, and is thought to be the first use of a technique known as the "siege parallel", a concept that remained in use until the mid-20th century. Although the Dutch failed to retake the city in 1676, it was returned under the terms of the 1678 Treaty of Nijmegen.
Text from the Wikipedia article Siege of Maastricht (1673), licensed CC BY-SA 4.0.