The Committee of Public Safety has appointed a military Commission to replace the existing Commission; it is composed of Arnold, Avrial, Johannard, Tridon, and Varein. Henri has been appointed Chief of the Staff of the War Ministry, and Mathieu commander of the troops posted between the Point du Jour and the Wagram Gate. All mechanics over 40 years of age have been called out to work at the city defences. They will receive 3f. 75c. as daily pay. Important resolutions are expected to be taken at the sitting of the Commune to-day, and the serious division will be terminated by the dissolution of the Central Committee, or by the absorption of the Committee of Public Safety in the Central Committee. The Commune announces that the Versailles troops were repulsed in several attacks made by them last night upon the barricades at Chatillon, Moulin de Pierre, and Moulin Saquet. There was a vigorous engagement yesterday evening at the Dauphine and Maillot Gates, and the Versailles troops were driven back with considerable loss. It is rumoured that Fort Montrouge has been evacuated. The Commune declares that it has a reserve force of 20,000 men. Of M. Thiers' house little more, it is feared, than the outer walls remain standing. MAY 17th The "Majority of the Commune"--as the Commune is now spoken of in consequence of the secession of 22 of its members--has resolved to form a Central Club like that of the Jacobins, composed of delegates from various clubs of Paris, in order to keep itself _en rapport_ with public opinion. The 12th Legion has formed a battalion of women, who in addition to their other military duties are to disarm publicly all runaways. The Communal Delegation of the 2d Arrondissement, considering that slavery was considered immoral even before the American War, and that a standing army has been suppressed by the Commune, decrees that all houses of ill fame in their quarter shall be immediately closed, as involving traffic in human beings. Peter's Restaurant was searched last night, and several arrests were made, among them officers of the National Guard suspected of complicity in the Tricolour Brassard Plot. The Restaurant is closed. The heaviest firing to-day has been against the Point du Jour. Large pieces of Marine Artillery have been placed on the ramparts behind Montrouge. A terrific explosion has just (6 o'clock) created general alarm. Enormous volumes of smoke are visible from a great distance. The cartridge manufactory near the Ecole Militaire has exploded. Six hundred _employes_, chiefly women, are said to have been killed. Bullets were launched in all directions, killing and wounding many passers by. The Insurgents have constructed a battery of Marine pieces, which much embarrasses the troops and retards the breaching works. Breaches will be opened at three points--namely, at Mortemart, opposite Auteuil, at Bastion 65, opposite the Parc-aux-Princes in the Bois and in the neighbourhood of Vaugirard.