The following are recommended as books of reference on subjects discussed in the three preceding chapters.

Mémorial pour la fortification permanente et passagère. Cormontaigne.

Défense des places. Cormontaigne.

Attaque des places. Cormontaigne.

Attaque des places. Vauban.

Traité des mines. Vauban.

Mémorial pour la castrametation et la fortification passagère. Lafitte-Clavé.

Exercice sur les fortifications. Davigneau.

Mémorial de l'officier du genie. A periodical of rare merit, containing most valuable military and scientific matter. It is conducted by officers of the French corps of engineers. It has already reached its fourteenth number, each number forming a volume.

Traité complet de fortification. Noizet de St. Paul.