Vauban and Thiers´ Paris

Vauban proposed to Louis XIV that Paris should be fortified.

Louis XIV refused. Instead he destroyed existing fortifications of Fosses Jaunes.

What did Vauban´s proposal look like?

From the brief descriptions... how did it compare to Thiers´ wall?

What would have been the effects if Louis XIV accepted the proposal and completed the fortifications?
 
Vauban proposed to Louis XIV that Paris should be fortified.

Louis XIV refused. Instead he destroyed existing fortifications of Fosses Jaunes.

What did Vauban´s proposal look like?

From the brief descriptions... how did it compare to Thiers´ wall?

What would have been the effects if Louis XIV accepted the proposal and completed the fortifications?

Extract from Vauban's Mémoire : "Cette première enceinte étant mise en sa perfection, en faire une seconde à la très grande portée du canon de la première, c’est-à-dire à 1,000 ou 1,200 toises de distance, occupant toutes les hauteurs convenables, ou qui peuvent avoir commandement sur la ville, comme celles de Belleville, de Montmartre, Chaillot, faubourg, Saint-Jacques,. Saint-Victor et tous les autres qui pourraient lui convenir." This first wall [fossés jaunes] being perfected, build a second wall at the most distant range of the first wall's canons, eg 1 000 or 1 200 leagues, enclosing all usable heights or hills with command over the city, like Belleville, Montmartre, Chaillot, Faubourg Saint-Jacques, Faubourg Saint-Victor and all others. Broken traduction is mine.

From what I understand, the proposal of Vauban was far less extended than Thiers' Paris, especially on the left Bank as neither Montparnasse nor Montsouris are listed. Other point is the huge cost of construction and maintenance of a double wall.
 
I believe that Louis XIV's refusal was born out of political rationals.
Into Louis XIV's reign, Paris had for some time a very unpleasant (to the king) habit of rising up, first against Henri III, standing up to Henri IV, and finally during the Fronde against Mazarin and Anne of Austria, respectively Louis XIV's mother and prime minister. That's also why he moved the court to Versaille, far enough from the Parisian mobs (but close enough to keep an eye).

Meanwhile, Thiers came up at a time the political primacy of Paris had been solidly reaffirmed during the Revolution and the national borders of France not anymore inviolate after the invasions of 1814 and 1815. Defending Paris had then become a strategical requisite.
 
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