Unfortunately, not much is known about this small and modest church, which makes this text very short.
It is closed, so that the only trace of fortification is not visible. It is a building in its simplest and most basic form: built entirely of bricks, rectangular plan, four walls and a bell tower. Certainly, there are imposing buttresses on either side of the entrance, but they were probably added later. More info: eglises-fortifiees-thierache.net/fr/oise-fr/crupilly