March 1871:

Army fails to seize Montmartre cannon: regular army troops sent to seize artillery fraternise with Paris National Guard subsequent skirmishing with loyal government forces ends with two army generals executed by National Guard. Thiers evacuates all army forces from Paris to Versailles.

Commune proclaimed Paris Hotel de Ville 26 March 1871: the Commune is not a Communist revolution but a reference to the French Revolution. The Commune in the French Revolution was the body responsible for the municipal government of Paris