But De Leyva appeared wholly unconcerned by the distress he saw around him. Harsh and inflexible, resolute in the performance of his duty, and callous to the sufferings of others, he looked on the people around him with a cold, unpitying eye. So long as the garrison could be fed, he cared not what became of the citizens. His worst apprehensions were caused by the mutinous spirit which on several occasions of late had been evinced by the German lanz-knechts under De Hohenzollern. He had tried to allay their discontent by promising them their pay, but as he could not make good his word, his assurances were treated with derision, and the men even threatened, if not paid, to deliver the city to the enemy. That this would be carried out, De Leyva became convinced by discovering that a secret correspondence existed between the Comte d'Azarnes, one of the German leaders, and Bonnivet. The knowledge of the secret thus obtained he prudently kept to himself, resolving to punish the treachery of Azarnes at a fitting season. As gold, however, must be obtained at whatever risk, he carefully thought over the matter, and at last conceived a stratagem by which he hoped that a supply of money might be safely passed through the French army. During a sortie which he made for the purpose into the park of Mirnbello, he despatched an emissary in whom he could confide, with instructions to Lannoy and Pescara, both of whom were at Lodi. While François, unable to take the city by assault, was proceeding by slower means, a plan was suggested to him by an officer belonging to the Duke d'Alençon, which promised success, and gave great uneasiness to the besieged. This was no less than to divert the main arm of the Ticino, which flowed past Pavia, into the lesser channel. If the plan could be accomplished, the city, being entirely undefended on this side, must necessarily fall. Every exertion, therefore, was used by the king to carry the scheme into effect. An enormous number of men were employed in damming up the main arm of the river, and in deepening and widening the channel of the lesser arm so as to receive its waters, and as the work progressed François was greatly elated by the prospect of success, while De Leyva attempted, though vainly, to fortify the exposed part of the city, which, when the bed of the river was laid dry, would be open to attack. On both sides the opinion now prevailed that Pavia was doomed, but its resolute commander held stoutly on, and would not listen to any terms of capitulation. Another day, and all would have been over, when just at the critical moment, while prayers were offered in the Duomo for the preservation of the city, torrents of rain began to fall, and continued to pour down without intermission for several hours, until the swollen waters of the Ticino could no longer be restrained, but, bursting the embankments reared against them, returned to their original channel.