In heraldry, a compartment is a design placed under the shield, usually a landscape or wreath of some sort upon which the supporters are depicted as standing. It is a comparatively late feature of heraldry.
Usually when arms are augmented by supporters, a compartment will be added too.
... joined it 1943.
There were other resistance groups like Liberte and Verite (that merged with Combat) and Gloria SMH (that was betrayed). Later Combat, Franc-Tireur and ...