His works on the subject of fortification, besides being elegantly written, contain the most valuable information of any works we have.

His most admired constructions are to be found at Metz, Thionville, and Bitche.
The beautiful crown works of Billecroix, at Metz, are perfect models of their kind.

Cormontaigne died in 1750.
Cotemporary with him were Sturin and Glasser.

The former deviated but slightly from the systems of his predecessors, but the latter invented several ingenious improvements which gave him great reputation.
Next follows Rosard, a Bavarian engineer; and Frederick Augustus, king of Poland, who devoted himself particularly to this art.

The former casemated only the flanks of his works, but the latter introduced casemate fire more extensively than any one who had preceded him.
In France, Belidor and De Filey published about the middle of the last century.