[2] The town is home to the national operational headquarters of the Luxembourgish Army at the Haerebierg Military Centre (located on the hill Herrenberg) and the National Museum of Military History, reflecting Diekirch's pivotal role in the Battle of the Bulge, a major battle of World War II.

In the 14th century, John, the blind king of Bohemia, fortified it, surrounding the place with a castellated wall and a ditch supplied by a stream.

Archaeological investigations in 1992–1993, 1999, and 2008 enabled the reconstruction of a large Roman villa, which extended over all the land of the medieval town and was abandoned in the early 5th century.

Held since 1968, it is open to both the military and civilians, with finishers earning the Medal of the "Marche de L’Armée", a Luxembourgish Army award.

The marches of 2020 and 2021 were canceled due to the Coronavirus Pandemic, and held as a virtual event in 2022, with the distances walked in different locations across the world.

[4][5][6] Diekirch has an annual cross country running competition — the Eurocross — which is an IAAF permit meeting and attracts world-class runners, with Gabriela Szabo and Irina Mikitenko among past winners.