Venice supported the claims of Azzo's illegitimate son, Fresco, against Azzo's brother, Francesco, who in turn sought support from Pope Clement V. Venice seized Castel Tedaldo in Ferrara, while parts of the city came under Papal control.
Venice had the support of Treviso and the Scaligers of Verona, but suffered critical setbacks, including failed revolts in Aquileia, Istria, and Zara.
The loss of the Marcamò fort blocked use of the Ferrarese branch of the Po River, and eventually the Venetian garrison in Ferrara, weakened by military defeats and disease, was overwhelmed in August 1309, after a relief fleet led by Marco Querini [it] was defeated.
Though the terms were harsh, Venice retained access to the Po over Ferrara, ensuring control over critical trade routes.
The tensions created by the war also played a role in the conception of the failed conspiracy of Marco Querini and Bajamonte Tiepolo in 1310.