But of all the results of the French annexation of Tunis, the most important was undoubtedly the Triple Alliance, into which Italy entered in resentment at having been deprived of the African territory which seemed marked out as its natural field for colonial expansion. The most manifest cause of Italian hostility towards France had passed away four years before the annexation of Tunis, when the reactionaries, who had favoured the restitution of the temporal power of the pope, fell for ever from power. The clericalism of the anti-republicans, who favoured a revival of the fatal policy of the Second Empire whereby France, after Magenta and Solferino, had by leaving its garrison at St Angelo, been the last obstacle to Italian unity, was one of the chief causes of their downfall. For after the war with Germany, the mutilated land and the vanquished nation had need to avoid wanton provocations of foreign powers. Henceforth the French Republic, governed by Republicans, was to be an anti-clerical force in Europe, sympathizing with the Italian occupation of Rome. But to make Italy realize that France was no longer the enemy of complete Italian unity it would have been necessary that all causes of irritation between the two Latin sister nations were removed. Such causes of dissension did, however, remain, arising from economic questions. The maritime relations of the two chief Mediterranean powers were based on a treaty of navigation of 1862--when Venice was no party to it being an Austrian port--which Crispi denounced as a relic of Italian servility towards Napoleon III. Commercial rivalry was induced by the industrial development of northern Italy, when freed from Austrian rule. Moreover, the emigrant propensity of the Italians flooded certain regions of France with Italian cheap labour, with the natural result of bitter animosity between the intruders and the inhabitants of the districts thus invaded. The annexation of Tunis, coming on the top of these causes of irritation, exasperated Italy. A new treaty of commerce was nevertheless signed between the two countries on the 3rd of November 1881. Unfortunately for its stability, King Humbert the previous week had gone to Vienna to see the emperor of Austria. In visiting in his capital the former arch-enemy of Italian unity, who could never return the courtesy, Rome being interdicted for Catholic sovereigns by the "prisoner of the Vatican," Humbert had only followed the example of his father Victor Emmanuel, who went both to Berlin and to Vienna in 1873. But that was when in France the duc de Broglie was prime minister of a clerical government of which many of the supporters were clamouring for the restitution of the temporal power. King Humbert's visit to Vienna at the moment when Gambetta, the great anti-clerical champion, was at the height of his influence was significant for other reasons. Since the 7th of October 1879 Germany and Austria had been united by a defensive treaty, and though its provisions were not published until 1888, the two central empires were known to be in the closest alliance. The king of Italy's visit to Vienna, where he was accompanied by his ministers Depretis and Mancini, had therefore the same significance as though he had gone to Berlin also. On the 20th of May 1882 was signed the treaty of the Triple Alliance, which for many years bound Italy to Germany in its relations with the continental powers. The alliance was first publicly announced on the 13th of March 1883, in the Italian Chamber, by Signor Mancini, minister for foreign affairs. The aim of Italy in joining the combination was alliance with Germany, the enemy of France. The connexion with Austria was only tolerated because it secured a union with the powerful government of Berlin. It effected the complete isolation of France in Europe. An understanding between the French Republic and Russia, which alone could alter that situation, was impracticable, as its only basis seemed to be the possibility of having a common enemy in Germany or even in England. But that double eventuality was anticipated by a secret convention concluded at Skiernewice in September 1884 by the tsar and the German emperor, in which they guaranteed to one another a benevolent neutrality in case of hostilities between England and Russia arising out of the Afghan question.