A collective defense arrangement was signed in
Belgrade on August 14, 1920, during a convention of Czechoslovakia and the
Kingdom of Serbs, Croats and Slovenes. The treaty guaranteed mutual assistance in the event of an unprovoked attack launched by Hungary against any stipulator. Ratifications were exchanged in Belgrade on February 10, 1921. Subsequently, Beneš suggested participation in the emerging alliance to
Romania on August 17, 1920, but his offer was rejected by the Romanian government. Although the mentioned treaty was signed, it did not serve as a regular allied convention. The allied conventions that formed the Little Entente were signed as follows: • The treaty between Czechoslovakia and Romania signed on April 23, 1921, in
Bucharest. Ratifications were exchanged in Bucharest on May 27, 1921. The treaty was prolonged by a supplementary protocols signed on May 7, 1923, June 13, 1926, and May 21, 1929. • The treaty between the
Kingdom of Serbs, Croats and Slovenes and Romania signed on June 7, 1921 in Belgrade. The treaty was prolonged by supplementary protocol on May 21, 1929. • The treaty between Czechoslovakia and the Kingdom of Serbs, Croats and Slovenes signed on August 31, 1922, in Belgrade. Ratifications were exchanged in Belgrade on October 3, 1922. The treaty was prolonged by additional protocols signed on September 19, 1928 and May 21, 1929. The mentioned conventions encompassed almost identical terms as the treaty of August 14, 1920. Again, it was stated that in the event of an unprovoked attack employed by Hungary against a certain stipulator, other parties should provide mutual assistance. In addition, the treaties defined the mutual assistance via a special military convention that was to be signed. Until such a convention came into force, interim measures were to be taken. The member states of the Little Entente also pledged themselves to co-operation in foreign policy towards Hungary. • All of those conventions were replaced by a comprehensive treaty of alliance between the governments of Romania, Yugoslavia and Czechoslovakia, signed in
Štrbské Pleso (now
Slovakia) on June 27, 1930, and entered into effect "immediately", according to Article 6. The treaty created a regular consultative structure for the Little Entente and required the ministers of foreign affairs of the parties to meet at least once a year. It was registered in
League of Nations Treaty Series on October 3, 1930. Ratifications were exchanged in Prague on November 25, 1930. During its formation, the Little Entente had to prove its determination of being a safeguard against any restoration sponsored by the Habsburgs. Firstly,
Charles I of Austria returned to Hungary from
Switzerland on March 26, 1921. He reclaimed the Hungarian throne, but his action earned neither the support of
Miklós Horthy nor the consent of the Little Entente. Thus, Charles was forced to leave the country on April 1, 1921. On October 20, 1921, however, he returned to Hungary and renewed his claims. The situation was complicated by the fact that Charles had managed to gain the support of a certain part of the army. The Little Entente reacted promptly, under the guidance of Beneš. Its member states began to mobilize their armies, and the threat of direct involvement from them was imminent. Moreover, other European powers expressed their opposition to Charles's attempts at restoration. The Hungarian government defeated Charles's followers and arrested him on October 24, 1921. That was followed by the Hungarian reluctance to deprive Charles of his titles and the increasing danger of a military incursion of the Little Entente into Hungary. Finally, the Hungarian government passed an act abrogating Charles's sovereign rights on November 10, 1921. == Consolidation ==