The National Register. — 1821-03-12 (London, England)

PARIS, MARCH 5. —We have just received a private letter from Naples, dated the 15th ult., which supplies the following details : To-day, at the breaking up of a long sitting, in which the report of a committee nominated the preceding evening to examine the ultimatum of the powers was read, the Prince Regent left the hall at the head of the members of the parliament, and pronounced, before the assembled multitude, the iiirru of a declaration of war against Austria and the coalesced powers. The troops have received orders to march. General Carascosa has taken the supreme command. Begani has int reached himself in Gaeta. The Neapolitan troops appear to have a design of marching against Rome. A proclamation in the Latin language, which it is thought has been drawn up at Naples, has been disseminated amongst. the Hungarian regiments which form part of the Austrian army in Italy.  VIENNA, i:Ch. 21.—Notwithstandiig all rumours to the contrary, the certainty of war has in no degree shaken public credit. One fact suffices to prove this ; the funds yesterday were at 70 15-16ths ; to-day they arc at 7:2, and every thing indicates a furthcr rise.  MADRID, Feb. 24.—Since the late disturbances, assassinations have increased in this capital : not a night passes without some new victim flitting beneath the stiletto.  The King's health gradually improves. His Majesty has resumed his accustomed airings. His carriage, and that containing his children, are now encircled by strong detachments of the regiment d'Almanza. It is remarked that the population of Madrid has recently been augmented very considerably by new residents. The last time that his Majesty went out numerous persons of distinction were observed amongst the crowd, in very simple attire. It appears that many eminent men, sincerely devoted to their Sovereign, make it a duty to watch over his sacred person ; and that if the scandalous scenes which took place on the 4th and sth instant should be revived, his Majesty will find, besides his guard, a thousand arms raised for his protection. The Manileur contains a report of the trial of Guindon, alias Ruyiefort, iound guiity of the murderof Marshal Brune. It was on the 2d of August, 1815, this shocking event took place. On the morning of that day the Marshal and his suite were passing through Avignon, on their way through Marseilles to Paris. The carriage was stopped and surrounded by an enraged multitude. They exclaimed that he must sutler the fate of the Duchess of Lambelle, whose head they charged him with baying carried on the top of a pike. The civil authorities were unable to protect him. He darted from his carriage, anJ sought refuge in the Paials Royal. Toe populace mounted the mit* and penetrated into the house. Having gut a view of the Marshal, they fired ..t hint. Ott the second shot the bullet entered the back of los neck, and passed quite through. The Marshall fell dead. It was proposed to bury the body immediately ; but the populace interfered, and threw it into the river.— Roquefort was one of the most violent and active among the populace. LISSON, Feb. 17.—0 n the 13th of this mouth the Portuguese galley Alexander I. entered the Tagus from Pernambuco, after a voyage of 48 days; the Captain of this galley reports, that two days beliire his departure news had been received from Rio Janeiro, that the arming of the vessel John IV.