They came out in rather straggling order to be marshalled even as they marched. Theodore's aim, and it was shrewd enough, was to reach the broad causeway of solid land between Corno and Popolo, where marshlands on either side would secure his flanks and compel the enemy to engage him on a narrow front. What was to follow he had not yet had time to consider. But if he could reach that objective, he would be secure for the present, and he could rest his men in the two hamlets on the marshes.

But a mile beyond Villanova, Bellarion was upon his left flank and rear. He had little warning of it before the enemy was charging him. But it was warning enough. He threw out his line in a crescent formation, using his infantry in a manner which merited Bellarion's entire approval, and obviously intent upon fighting a rearguard battle whilst bringing his army to the coveted position.

But the infantry were not equal to their commander, and they were insufficiently trained in these tactics. Some horses were piked, but almost every horse piked meant an opening in the human wall that opposed the charge, and through these openings Giasone Trotta's heavy riders broke in, swinging their ponderous maces. From a rearguard action on Theodore's part, the thing grew rapidly to the proportions of a general engagement, and for this Theodore could not have been placed worse than he was with his left, now that he had swung about, upon the quaking boglands of Dalmazzo and his back to the broad waters of the Po. He swung his troops farther round, so as to bring his rear upon the only possible line of retreat, which was that broad firm land between Corno and Populo. At last his skilful manœuvres achieved the desired result, and then, very gradually, fighting every inch of the ground, he began to fall back. At every yard now the front must grow narrower, and unless Bellarion's captains were very sure of their ground, some of them would presently be in trouble in the bogs on either side. If this did not happen, they would soon find it impossible, save at great cost and without perceptible progress, to continue the engagement, and with night approaching they would be constrained to draw off. Theodore smiled darkly to himself in satisfaction, and took heart, well pleased with his clever tactics by which he had extricated himself from a dangerous situation. He had won a breathing-space that should enable him to marshal his men so as to deal with this rash enemy who came to seek him in the open.

And then suddenly, a quarter-mile away, from the direction of Corno, towards which they were so steadily falling back, came a pounding of hooves that swelled swiftly into a noise of thunder, and, before any measures could be taken to meet this new menace, Ugolino da Tenda's horse was upon Theodore's rear.

Ugolino had handled his condotta well, and strictly in accordance with his orders from Bellarion. From Balzola, whither he had been moved at noon so as to be in readiness, he had made a leisurely and cautious advance, filing his horse along the very edge of the bogland so that their hooves should give no warning of their approach. Thus until he had won within striking distance. And the blow he now struck, heavy and unexpected, crumpled up Theodore's rear, clove through, driving his men right and left to sink to their waists in the marshes, and scattered such fear and confusion in those ahead that their formation went to pieces, and gaped to Bellarion's renewed frontal attacks.

Less than three hours that engagement lasted, and of all those who had taken the field with Theodore, saving perhaps a thousand who fled helter-skelter towards Trino after Ugolmo's passage, there was not a survivor who had not yielded. Stripped of their arms and deprived of their horses, they were turned adrift, to go whithersoever they listed so long as it was outside of Montferrat territory. The maimed and wounded of Theodore's army were conveyed by their fellows into the villages of Villanova, Terranova, and Grassi.

It was towards the third hour of that November night when the triumphant army, returning from that stricken field, reëntered Casale, lighted by the bonfires that blazed in the streets, whilst the bells of Liutprand's Cathedral crashed out their peals of victory. Deliriously did the populace acclaim Bellarion, Prince of Valsassina, in its enormous relief at being saved the hardships of a siege and delivered from the possible vengeance of Theodore for having opened its gates to Theodore's enemies.

Theodore, on foot, marched proudly at the head of a little band of captives of rank, who had been retained by their captors for the sake of the ransoms they could pay. The jostling, pushing crowd hooted and execrated and mocked him in his hour of humiliation. White-faced, his head held high, he passed on apparently unmoved by that expression of human baseness, knowing in his heart that, if he had proved master, the acclamations now raised for his conqueror would have been raised for him by the very lips that now execrated him.

He was conducted to the palace, to the very room whence for so many years he had ruled the State of Montferrat, and there he found his nephew and niece awaiting him when he was brought in between Ugolino da Tenda and Giasone Trotta.

Bareheaded, stripped of his armour, his tall figure bowed, he stood like a criminal before them whilst they remained seated on either side of the writing-table that once had been his own. From the seat whence he had dispensed justice was justice now to be dispensed to him by his nephew.