• Maginot line
• Secteur de Boulay
• Hackenberg

• Outside
• Entrance ammunition
• Entrance personnel
• Block 8
• Block 9
• Block 10
• Block 12
• Block 21
• Block 22
• Block 23
• Block 24
• Block 25

• Inside
• Weapons
• Turret
• Other I
• Other II

Block 21

This block has a 7.5 cm gun, a 5cm mortar, Mg and an observation cupola.

A Reibel position in the top center and mortar below.

Embrasure for the flanking light MG FM 24/29.