During the fifth and last phase of the Wars in Lombardy, in 1452 the Province of Brescia was invaded and conquered by the Milanese army, commanded by Francesco Sforza, the Duke of Milan.

In the next year, Jacopo Piccinino (at the head of the Serenissima's army), brought back Pontevico after four days of siege.

During the summer, the venetian army, camped at Pontevico, attacked many time the milanese one, situated in his strongholds of Seniga and Robecco d'Oglio, without ever getting an important win.

The milanese bombards hit hard the fortress' bastions, indeed after two days of siege some Sforza's soldiers saw an opening in the defensive walls and tried to enter in the castle, failing.

On October 19, under the Sforza's order, the milanese soldiers launched a heavy assault on a single bastion.