Montalembert's Monks of the West gives the early history very fully; the later history, to the beginning of the 18th century, may be found in Helyot, Hist.
Without sharing Montalembert's antipathy to the bastioned trace, and his predilection for high masonry caponiers, he followed out the principle of retarding the development of the attack, and provided for the most active defence.
Gasquet, Sketch of Monastic Constitutional History (pp. viii.-xxii.), the Introduction to 2nd edition of the translation of Montalembert's Monks of the West (1895).
De Montalembert's Un Moine au XIX' eme siecle (Paris, 1862 - English translation by F.