Fiume is the Adriatic city at the center of a struggle over national borders, political loyalty, and the meaning of postwar victory. Under Gabriele D’Annunzio, it became both a contested territory and a stage for defiance of Italy’s government. Its fate exposed a divide within fascism: while D’Annunzio’s supporters treated the city as a cause demanding action, Benito Mussolini accepted diplomatic compromise and turned his attention toward political power elsewhere. The siege of 1920 ended D’Annunzio’s rule, but the dispute remained open until an agreement with Yugoslavia transferred Fiume to Italy in 1924.

Adriatic Setting and Contested Status

The Rapallo Treaty, announced on November 12, 1920, redrew Italy’s eastern borders and made Fiume independent. The settlement also assigned Zadar to Italy, without its surrounding inland area or nearby islands, while Dalmatia was relinquished. Sussak, Fiume’s eastern coastal suburb, including Port Baross, went to Croatia. Fiume was thus neither Italian nor Croatian under the arrangement, and its separation from Sussak cut it off from maritime trade with the East. These details made the settlement more than a question of symbolism: it determined the city’s political status and constrained its access to a wider trading world.

Fiume’s disputed position had accumulated meaning through D’Annunzio’s presence there. To his followers, the city embodied a national claim that the diplomatic settlement had failed to satisfy. To the Italian government, however, it was an issue to be resolved through negotiation. The contrast between those positions made Fiume a test of whether patriotic commitment meant enforcing a maximal territorial claim or accepting a compromise in the name of national discipline.

Rapallo and the Fascist Division

Mussolini publicly described himself as satisfied with the Rapallo settlement, while distinguishing his reservations about Dalmatia from his approval of the agreement’s overall direction. He argued that the terms should be accepted as an accomplished fact and presented acceptance as an act of national discipline. His position sharply contrasted with the expectations of the Fiume fascists, who regarded his endorsement as a betrayal of their cause. In the city, fascists who held party cards joined others in burning copies of Il Popolo d’Italia containing his article, and sent the newspaper a bitter protest.

The dispute surfaced inside the Fascist Central Committee in Milan on November 15. Mussolini argued that the settlement should be accepted, while Pietro Marsich, a prominent D’Annunzian leader, defended the continuing significance of the movement begun in 1915. The Dalmatian delegates’ objections further intensified the meeting: they saw the treaty as consigning Italian communities to Croatian rule. The argument revealed a practical divide. D’Annunzio’s initiative could be celebrated as a dramatic national revolt, Mussolini suggested, but its continuation risked weakening the country while socialists remained a political threat. Fiume consequently became a fault line between uncompromising irredentism and the leadership’s effort to contain the movement within a broader political strategy.

The Siege and the End of D’Annunzio’s Rule

D’Annunzio attempted to secure help from the fascists as the Italian government moved against the city. On December 1, 1920, acting on Giovanni Giolitti’s orders, two armored battleships, eight torpedo destroyers, and two tugs were deployed before Fiume’s port. The siege began, and the city came under attack. D’Annunzio sent Alceste De Ambris, an old political ally, to make a final appeal for fascist assistance to the Fiume Legionnaires.

As the city faced an imminent assault, a letter from D’Annunzio reached Mussolini in Milan on Christmas Eve. Delivered by Captain Balisti after an overnight journey, it asked the fascists to honor their promise to rise up if Fiume suffered a fratricidal attack. Mussolini declined to act, judging that the authorities could arrest the fascists before they could help. His response made the gap between political solidarity and practical support explicit: he could recognize D’Annunzio’s stature while refusing to expose his movement to a confrontation with the state.

The assault began before D’Annunzio had issued a clear order to fire. Italian Royal Army troops surrounded and captured some of the first Fiume Legionnaires to advance near Cantrida. Over the next forty-eight hours, bombardment continued, and civilians were killed or wounded. On December 28, General Ferrario refused to negotiate surrender terms and threatened heavier bombardment. Representatives of the city urged D’Annunzio to surrender. He gave up the authority entrusted to him on September 12 and transferred power to the mayor and people of Fiume, saying that he could not impose ruin and death on the city. On December 31, an agreement signed in Abbazia provided for the complete demobilization of the legionnaires from the city. The transfer of authority and the demobilization ended D’Annunzio’s rule, not the political afterlife of Fiume.

Political Memory and Final Settlement

Fiume remained a point of reference in later confrontations between D’Annunzio and Mussolini. In 1922, D’Annunzio rejected an attempt by Mussolini to meet with him. He also objected to Mussolini’s association with the naval force that had tried to destroy his Fiume enterprise. As Mussolini prepared to march on Rome, D’Annunzio saw him adopting the marches, mottos, and salutes associated with the earlier struggle while discarding its ideals. Fiume therefore persisted not only as a territorial dispute but as a contested political inheritance: a repertoire of gestures and symbols that Mussolini could use even as he declined to follow D’Annunzio’s course there.

The settlement came through diplomacy rather than another armed expedition. In January 1924, Mussolini signed an accord with Yugoslavia granting Fiume to Italy. The agreement healed a dispute that had endured since 1919 and gave Mussolini a diplomatic achievement to set against D’Annunzio’s earlier attempt to resolve the question through force and spectacle. Fiume’s arc—from disputed independence, through siege and demobilization, to transfer by agreement—shows how the city’s political meaning outlasted the regime established there. It remained a measure of the distance between D’Annunzio’s defiant ideal and Mussolini’s pursuit of power through negotiation as well as force.