I will give the answer, it's quite hard :
The Baron Haussmann, under Napoleon III, rebuilt Paris, several quarters.
The streets become wider, nicer too, the place were the junction point of several wide streets.
And Hindenburg said "Paris" because he said "it's the only city where you can control 7 streets with one machine gun nest."
Because the new Paris of Haussmann was also studied for this reason, tio avoid the uprising, the insurrection.
put a barricade in a small street, wide of 5 meters. easy.
But a barricade on a great boulevard wide of 50 meters, it's really hard.
Other point : a wide street makes possible a charge of cavalry.
And finally, look at the Place de L'Etoile, with the Arc de Triomphe :
Here, with one single machine gun nest, with one signle guns battery, you can control all the streets.
For "Paris aux barricades" in 1968 : don't know really what you want about it, if it is the signification, it's this one : troubles in Paris and FRance in may 1968, with the students.
They were fights between them and the CRS, and the police.
And lot of people did the relation between this uprising and the 1830's and 1848's revolution. Where paris had a lot of barricades to fight the royalist troops.
I ask a more conventional question :
Battle of Middle Age, under the rule of Philippe II Auguste, France against Flander, Empire and England.
fortunatly, France won, after this hard battle, where the king Philippe was not far to be killed.
