Immediately after the battle of Pola, the Venetians had entered into negotiations with Hungary, to endeavour to detach that power from the league against them. But the demands of King Louis were too extravagant to be accepted. He demanded the cession of Trieste, the recognition of the suzerainty of his crown on the part of the present doge, and all his successors, an annual tribute of one hundred thousand ducats, and half a million of ready money. This demand was so excessive that, even in their distress, the Venetians refused to accept it, and hastened on their preparations for a struggle for life or death.

Fortunately, the Genoese continued for three months, after their success at Pola, to capture the outlying possessions of Venice, instead of striking at the capital. Towards the end of July, seventeen Genoese vessels appeared off Pelestrina, burned a merchant ship lying there, and spent the day in reconnoitring positions, and in taking soundings of the shallows and canals off Brondolo. They then sailed away for Dalmatia. In less than a week six galleys again hove in sight; and Admiral Giustiniani, who was in supreme command of the forces, issued out from the Lido, with an equal number of ships, to give them battle.

On his way, however, a black object was seen in the water. As they neared it, this was seen to be the head of a swimmer. He was soon picked up, and was found to be a Venetian citizen, named Savadia, who had been captured by the enemy, but had managed to escape, and was swimming towards land to warn his countrymen that the whole Genoese fleet, of forty-seven sail, under Pietro Doria, was close at hand; and that the six ships in the offing were simply a decoy, to tempt the Venetians to come out and give battle.

Giustiniani at once returned to port, and scarcely had he done so, than the whole Genoese fleet made its appearance. They approached the passage of the Lido; but the respite that had been afforded them had enabled the Venetians to make their preparations, and the Genoese found, to their disappointment, that the channels of the Lido and Malamocco were completely closed up with sunken vessels, palisades, and chains; and they sailed away to seek another entry through which they could strike at Venice.

Had the same precautions, that had proved so effective at the Lido and Malamocco passages, been taken at all the other channels; Venice could have defied all the efforts of Doria's fleet.

The city is situated on a group of small islands, rising in the midst of a shallow basin twenty-five miles long and five wide, and separated from the sea by a long sandbank, formed by the sediment brought down by the rivers Piave and Adige. Through this sandbank the sea had pierced several channels. Treporti, the northern of these channels, contained water only for the smallest craft. The next opening was known as the port of Lido, and separated the island of San Nicolo from Malamocco. Five miles farther on is the passage of Malamocco, between that island and Pelestrina. Southwest of Pelestrina lay Brondolo, behind which stood Chioggia, twenty miles distant from Venice. The southern point of Brondolo was only separated by a small channel--called the Canal of Lombardy--from the mainland.

Unfortunately, at Brondolo the channel had not been closed. All preparations had been made for doing so, but the work had been postponed until the last moment, in order that trading vessels might enter and leave the harbour, the Chioggians believing that there was sure to be sufficient warning, of the approach of an enemy, to enable them to close the entrance in time. The sudden appearance of Doria's fleet before Brondolo upset all these calculations, and the Genoese easily carried the position. Little Chioggia, the portion of the town separated from the rest by the Canal of Santa Caterina, was captured without difficulty; but the bridge across the canal was strongly defended by bastions and redoubts, and here Pietro Emo made a brave stand, with his garrison of three thousand five hundred men.

The enemy at once erected his batteries, and, on the 12th of August, the Genoese opened fire. The Venetians replied stoutly, and for three days a heavy cannonade was kept up on both sides. Reinforcements had reached the garrison from Venice, and, hour by hour, swift boats brought the news to the city of the progress of the fight.

So far, all seemed going on well. The Genoese had suffered heavily, and made no impression upon the batteries at the head of the bridge. The days passed in Venice in a state of restless disquietude. It was hoped and believed that Chioggia could successfully defend itself; but if it fell, the consequence would be terrible.

Already the Hungarians had overrun the Venetian possessions on the mainland, the Lord of Padua was in the field with his army, and communication was cut with Ferrara, their sole ally. Should Chioggia fall, the Genoese fleet would enter the lagoons, and would sail, by the great channel through the flats, from Chioggia to Venice; and their light galleys could overrun the whole of the lagoons, and cut off all communication with the mainland, and starvation would rapidly stare the city in the face.