A detachment of cavalry was sent in pursuit; but, like wild animals, they had retreated to their lair in the woods, and there disappeared.
This unexpected engagement, in all probability arranged beforehand by the Spanish and German envoys, produced on the whole army the effect of a spark applied to a train of gunpowder.

Commines and the Venetian 'proveditori' each tried in vain to arrest the combat an either side.
Light troops, eager for a skirmish, and, in the usual fashion of those days, prompted only by that personal courage which led them on to danger, had already come to blows, rushing down into the plain as though it were an amphitheatre where they might make a fine display of arms.

Far a moment the young king, drawn on by example, was an the point of forgetting the responsibility of a general in his zeal as a soldier; but this first impulse was checked by Marechal de Gie, Messire Claude de la Chatre de Guise, and M.de la Trimauille, who persuaded Charles to adopt the wiser plan, and to cross the Taro without seeking a battle,--at the same time without trying to avoid it, should the enemy cross the river from their camp and attempt to block his passage.

The king accordingly, following the advice of his wisest and bravest captains, thus arranged his divisions.
The first comprised the van and a body of troops whose duty it was to support them.

The van consisted of three hundred and fifty men-at-arms, the best and bravest of the army, under the command of Marechal de Gie and Jacques Trivulce; the corps following them consisted of three thousand Swiss, under the command of Engelbert der Cleves and de Larnay, the queen's grand equerry; next came three hundred archers of the guard, whom the king had sent to help the cavalry by fighting in the spaces between them.
The second division, commanded by the king in person and forming the middle of the army, was composed of the artillery, under Jean de Lagrange, a hundred gentlemen of the guard with Gilles Carrone far standard-bearer, pensioners of the king's household under Aymar de Prie, some Scots, and two hundred cross-bowmen an horseback, with French archers besides, led by M.de Crussol.
Lastly, the third division, i.e.the rear, preceded by six thousand beasts of burden bearing the baggage, was composed of only three hundred men-at-arms, commanded by de Guise and by de la Trimouille: this was the weakest part of the army.
When this arrangement was settled, Charles ordered the van to cross the river, just at the little town of Fornovo.