Bonnivet considered it his duty to abandon it and fall back towards Piedmont, where he reckoned upon finding a corps of five thousand Swiss who were coming to support their compatriots engaged in the service of France.

Near Romagnano, on the banks of the Sesia, the retreat was hotly pressed by the imperial army, the command of which had been ultimately given by Charles V.to the Constable de Bourbon, with whom were associated the Viceroy of Naples, Charles de Lannoy, and Ferdinand d'Avalos, Marquis of Pescara, the most able amongst the Neapolitan officers.

On the 30th of April, 1524, some disorder took place in the retreat of the French; and Bonnivet, being severely wounded, had to give up the command to the Count of St.Pol and to Chevalier Bayard.

Bayard, last as well as first in the fight, according to his custom, charged at the head of some men-at-arms upon the Imperialists, who were pressing the French too closely, when he was himself struck by a shot from an arquebuse, which shattered his reins.
"Jesus, my God," he cried, "I am dead!" He then took his sword by the handle, and kissed the cross-hilt of it as the sign of the cross, saying aloud as he did so, "Have pity on me, O God, according to Thy great mercy" (Miserere mei, Deus, secundum magnam misericordiam tuam); thereupon he became incontinently quite pale, and all but fell; but he still had heart enough to grasp the pommel of the saddle, and remained in that condition until a young gentleman, his own house-steward, helped him to dismount and set him down under a tree, with his face to the enemy.
The poor gentleman burst into tears, seeing his good master so mortally hurt that remedy there was none; but the good knight consoled him gently, saying, "Jacques, my friend, leave off thy mourning; it is God's will to take me out of this world; by His grace I have lived long therein, and have received therein blessings and honors more than my due.

All the regret I feel at dying is that I have not done my duty so well as I ought.