Infantry casemates These bunkers were armed with twin machine-guns (abbreviated as JM — Jumelage de mitrailleuses — in French) and anti-tank guns of . They could be single (with a firing room in one direction) or double (two firing rooms in opposite directions). These generally had two floors, with a firing level and a support/infrastructure level that provided the troops with rest and services (power-generating units, reserves of water, fuel, food, ventilation equipment, etc.). The infantry casemates often had one or two "cloches" or turrets located on top of them. These GFM cloches were sometimes used to emplace machine guns or observation periscopes. 20 to 30 men manned them.
Infantry casemates These bunkers were armed with twin machine-guns (abbreviated as JM — Jumelage de mitrailleuses — in French) and anti-tank guns of . They could be single (with a firing room in one direction) or double (two firing rooms in opposite directions). These generally had two floors, with a firing level and a support/infrastructure level that provided the troops with rest and services (power-generating units, reserves of water, fuel, food, ventilation equipment etc.). The infantry casemates often had one or two "cloches" or turrets located on top of them. These GFM cloches were sometimes used to emplace machine guns or observation periscopes. 20 to 30 men manned them.