When the last had marched away to be absorbed into the darkness, and the song of the Germans at the head of the column had faded out of earshot, muffled by the tramp of the rearguard, Facino with his little knot of personal attendants set out to follow.

Towards noon of the following day, with Melegnano well behind them, they came to a halt in the hamlet of Ospedaletto, having covered twenty-five miles in that first almost unbroken march. The pace was not one that could be maintained, nor would it have been maintained so long but that Facino was in haste to reach the south bank of the Po before Buonterzo could cross. Therefore, leaving the main army to rest at Ospedaletto, he pushed on with five hundred lances as far as Piacenza. With these at need he could hold the bridgehead, whilst waiting for the main army to join him on the morrow.

At Piacenza, however, there was still no sign of the enemy, and in the Scotti who held the city—one of the possessions wrested from the Duchy of Milan—Facino found an unexpected ally. Buonterzo had sent to demand passage of the Scotti. And the Scotti, with the true brigand instinct of their kind, had replied by offering him passage on terms. But Buonterzo, the greater brigand, had mocked the proposal, sending word back that, unless he were made free of the bridge, he would cross by force and clean up the town in passing. As a consequence, whilst Buonterzo's advance was retarded by the necessity of reaching Piacenza in full force, Facino was given free and unhindered passage by the Scotti, so that he might act as a buckler for them.

Having brought his army on the morrow safely across the Po, Facino assembled it on the left bank of the little river Nure. He destroyed the bridge by which the Æmilian Way crosses the stream at Pontenure, and sat down to await Buonterzo, who was now reported to be at Firenzuola, ten miles away.

Buonterzo, however, did not come directly on, but, quitting the Æmilian Way, struck south, and, crossing the shallow hills into the valley of the Nure, threatened thence to descend upon Facino's flank.

That was the beginning of a series of movements, of marchings and counter-marchings, which endured for a full week without ever bringing the armies in sight of each other. These manœuvres carried them gradually south, and their operations became a game of hide-and-seek among the hills.

At first it bewildered Bellarion that two commanders, each of whom had for aim the destruction of the other, should appear so sedulously to avoid an engagement. But in the end, he came to understand the spirit actuating them. Each fought with mercenary troops, and just as it is not the business of mercenaries to get themselves killed, neither is it their business to slay if slaughter can be avoided. They fought for profit, and whilst prisoners were profitable, since they yielded not only arms and horses, but also ransoms, dead men yielded nothing beyond their harness. Therefore they demanded that their commanders should lead them as nearly as possible into a position of such strategical advantage that the enemy, perceiving himself at their mercy, should have no choice but to surrender. To this general rule the only exception was afforded by the Swiss, who were indifferent to bloodshed. But of Swiss there were only a few on Facino's side, and none at all on Buonterzo's.

At the end of a week, after endless manœuvres, matters were very much as they had been at the beginning. Buonterzo had fallen back again on Firenzuola, hoping to draw Facino into open country, whilst Facino, refusing to be drawn, lay patiently at San Nicoló.

Three days Facino waited there, to be suddenly startled by the news that Buonterzo was at Aggazano, eight miles away. Suspecting here an attempt to slip past him and, by crossing perhaps at Stradella, to invade the territory of Milan, and also because he conceived that Buonterzo had placed himself in a disadvantageous position, leaving an opening for attack, Facino decided upon instant action.

In the best house of San Nicoló, which he had temporarily adopted for his quarters, Facino assembled on the morning of the 10th of May his chief officers, Francesco Busone of Carmagnola, Koenigshofen, the Swiss Werner von Stoffel, and the French commander de Cadillac.