Louis André de La Mamye de Clairac (1695-1752), "Chevalier de Clairac", born in Freiburg, Baden-Wurttemberg, Germany. He served six years in the infantry before being received as an engineer in 1712. He participated in numerous sieges during the wars of succession of Spain, Poland and Austria. He finished as brigadier of the corps and commander of Fort François in Bergues.
 
Reference military architecture treaty decorated with 36 folding plates engraved by Claude-Charles Riolet including the plans of Chateau Naterberg near Deckendorf (Burgruine Natternberg near Deggendorf), Le Chateau d'O and Pilsting (Burg Leonsberg), in Bavaria, of Spire (Speyer), Fort Louis, Russenheim (Russheim) near the Rhine, of the camp of Nordheim (1745), of the battle de Fontenoy (1745). If the art of fortifying places of war is the most essential and the most brilliant for an engineer, says Clairac, an army entrenched with intelligence can also cover a country, make up for numbers, arrest a superior enemy or force him to fight at a disadvantage. To the general maxims of fortification, he added some specific to field works. Redoubts (Redoute ) and forts must contain or embrace, for equal development, as much land as possible, having regard to the circumstances, so that their occupants can maneuver more comfortably. The redoubts have shown their usefulness to Fontenoy. Joining Folard and Maurice de Saxe, Clairac recognizes that "" when the enemy is close, especially in columns, direct fire rarely stops him "". He then details different types of country fortifications: forts, bridgeheads, how to fortify a cemetery, a church, an old castle, a village. He talks about entrenched camps, works to be done on a battle day, the use of the flood, etc.