During World War I, Sir William Birdwood, 1st Baron Birdwood, and Australian soldiers were stationed at the château. It was partly bombed by the German invaders in 1918. The left wing of the château was left in ruins, but the rest of it was made habitable. During World War I, the Comtesse de Hénencourt took care of the estate and all of the soldiers that stayed there.
- Base Mérimée: Château d'Hénencourt, Ministère français de la Culture. (in French)
- Australians on the Western Front, 1914-1918: A nice bed to sleep in - Hénencourt Chateau
- Gibbs, Philip (February 15, 2009). Now It Can Be Told. Alan Earls and David Widger.
- "Charles Malo Fraincois de Lameth".