Instantly Farnese set himself to the work which, had he followed his own judgment, would already have been accomplished. Henry with his cavalry had established himself at Dieppe and Arques, within a distance of five or six leagues from the infantry engaged in the siege of Rouen. Alexander saw the profit to be derived from the separation between the different portions of the enemy's forces, and marched straight upon the enemy's entrenchments. He knew the disadvantage of assailing a strongly fortified camp, but believed that by a well-concerted, simultaneous assault by Villars from within and the Leaguers from without, the king's forces would be compelled to raise the siege or be cut up in their trenches.

But Henry did not wait for the attack. He had changed his plan, and, for once in his life, substituted extreme caution for his constitutional temerity. Neither awaiting the assault upon his entrenchments nor seeking his enemy in the open field, he ordered the whole camp to be broken up, and on the 20th of April raised the siege.

Farnese marched into Rouen, where the Leaguers were received with tumultuous joy, and this city, most important for the purposes of the League and for Philip's ulterior designs, was thus wrested from the grasp just closing upon it. Henry's main army now concentrated itself in the neighbourhood of Dieppe, but the cavalry under his immediate superintendence continued to harass the Leaguers. It was now determined to lay siege to Caudebec, on the right bank of the Seine, three leagues below Rouen; the possession of this place by the enemy being a constant. danger and difficulty to Rouen, whose supplies by the Seine were thus cut off.

Alexander, as usual, superintended the planting of the batteries against the place. He had been suffering during the whole campaign with those dropsical ailments which were making life a torture to him; yet his indomitable spirit rose superior to his physical disorders, and he wrought all day long on foot or on horseback, when he seemed only fit to be placed on his bed as a rapid passage to his grave. On this occasion, in company with the Italian engineer Properzio, he had been for some time examining with critical nicety the preliminaries, for the siege, when it was suddenly observed by those around him that he was growing pale. It then appeared that he had received a musket-ball between the wrist and the elbow, and had been bleeding profusely; but had not indicated by a word or the movement of a muscle that he had been wounded, so intent was he upon carrying out the immediate task to which he had set himself. It was indispensable, however, that he should now take to his couch. The wound was not trifling, and to one in his damaged and dropsical condition it was dangerous. Fever set in, with symptoms of gangrene, and it became necessary to entrust the command of the League to Mayenne. But it was hardly concealed from Parma that the duke was playing a double game. Prince Ranuccio, according to his father's express wish, was placed provisionally at the head of the Flemish forces. This was conceded; however, with much heart-burning, and with consequences easily to be imagined.

Meantime Caudebec fell at once. Henry did nothing to relieve it, and the place could offer but slight resistance to the force arrayed against it. The bulk of the king's army was in the neighbourhood of Dieppe, where they had been recently strengthened by twenty companies of Netherlanders and Scotchmen brought by Count Philip Nassau. The League's headquarters were in the village of Yvetot, capital of the realm of the whimsical little potentate so long renowned under that name.

The king, in pursuance of the plan he had marked out for himself, restrained his skirmishing more than was his wont. Nevertheless he lay close to Yvetot. His cavalry, swelling and falling as usual like an Alpine torrent, had now filled up its old channels again, for once more the mountain chivalry had poured themselves around their king. With ten thousand horsemen he was now pressing the Leaguers, from time to time, very hard, and on one occasion the skirmishing became so close and so lively that a general engagement seemed imminent. Young Ranuccio had a horse shot under him, and his father—suffering as he was—had himself dragged out of bed and brought on a litter into the field, where he was set on horseback, trampling on wounds and disease, and, as it were, on death itself, that he might by his own unsurpassed keenness of eye and quickness of resource protect the army which had been entrusted to his care. The action continued all day; young Bentivoglio, nephew of the famous cardinal, historian and diplomatist, receiving a bad wound in the leg, as he fought gallantly at the side of Ranuccio. Carlo Coloma also distinguished himself in the engagement. Night separated the combatants before either side had gained a manifest advantage, and on the morrow it seemed for the interest of neither to resume the struggle.

The field where this campaign was to be fought was a narrow peninsula enclosed between the sea and the rivers Seine and Dieppe. In this peninsula, called the Land of Caux, it was Henry's intention to shut up his enemy. Farnese had finished the work that he had been sent to do, and was anxious, as Henry was aware, to return to the Netherlands. Rouen was relieved, Caudebec had fallen. There was not food or forage enough in the little peninsula to feed both the city and the whole army of the League. Shut up in this narrow area, Alexander must starve or surrender. His only egress was into Picardy and so home to Artois, through the base of the isosceles triangle between the two rivers and on the borders of Picardy. On this base Henry had posted his whole army. Should Farnese assail him, thus provided with a strong position and superiority of force, defeat was certain. Should he remain where he was, he must inevitably starve. He had no communications with the outside. The Hollanders lay with their ships below Caudebec, blockading the river's mouth and the coast. His only chance of extrication lay across the Seine. But Alexander was neither a bird nor a fish, and it was necessary, so Henry thought, to be either the one or the other to cross that broad, deep, and rapid river, where there were no bridges, and where the constant ebb and flow of the tide made transportation almost impossible in face of a powerful army in rear and flank. Farnese's situation seemed, desperate; while the shrewd Bearnese sat smiling serenely, carefully watching at the mouth of the trap into which he had at last inveigled his mighty adversary. Secure of his triumph, he seemed to have changed his nature, and to have become as sedate and wary as, by habit, he was impetuous and hot.

And in truth Farnese found himself in very narrow quarters. There was no hay for his horses, no bread for his men. A penny loaf was sold for two shillings. A jug of water was worth a crown. As for meat or wine, they were hardly to be dreamed of. His men were becoming furious at their position. They had enlisted to fight, not to starve, and they murmured that it was better for an army to fall with weapons in its hands than to drop to pieces hourly with the enemy looking on and enjoying their agony.

It was obvious to Farnese that there were but two ways out of his dilemma. He might throw himself upon Henry—strongly entrenched as he was, and with much superior forces to his own, upon ground deliberately chosen for himself—defeat him utterly, and march over him back to the Netherlands. This would be an agreeable result; but the undertaking seemed difficult, to say the least. Or he might throw his army across the Seine and make his escape through the isle of France and Southern Picardy back to the so-called obedient provinces. But it seemed, hopeless without bridges or pontoons to attempt the passage of the Seine.

There was; however, no time left, for hesitation. Secretly he took his resolution and communicated it in strict confidence to Mayenne, to Ranuccio, and to one or two other chiefs. He came to Caudebec, and there, close to the margin of the river, he threw up a redoubt. On the opposite bank, he constructed another. On both he planted artillery, placing a force of eight hundred Netherlanders under Count Bossu in the one, and an equal number of the same nation, Walloons chiefly, under Barlotte in the other. He collected all the vessels, flatboats,— wherries,—and rafts that could be found or put together at Rouen, and then under cover of his forts he transported all the Flemish infantry, and the Spanish, French, and Italian cavalry, during the night of 22nd May to the 22 May, opposite bank of the Seine. Next morning he sent up all the artillery together with the Flemish cavalry to Rouen, where, making what use he could by temporary contrivances of the broken arches of the broken bridge, in order to shorten the distance from shore to shore, he managed to convey his whole army with all its trains across the river.