The Florentines, alarmed by this circumstance, and reduced to despondency by their frequent losses, thought themselves unable to sustain the war alone, and sent ambassadors to the Venetians, to beg they would lend their aid to oppose the greatness of one who, if allowed to aggrandize himself, would soon become as dangerous to them as to the Florentines themselves. The Venetians were advised to adopt the same course by Francesco Carmignuola, one of the most distinguished warriors of those times, who had been in the service of the duke, and had afterward quitted it; but they hesitated, not knowing how far to trust him; for they thought his enmity with the duke was only feigned. While in this suspense, it was found that the duke, by means of a servant of Carmignuola, had caused poison to be given him in his food, which, although it was not fatal, reduced him to extremity. The truth being discovered, the Venetians laid aside their suspicion; and as the Florentines still solicited their assistance, a treaty was formed between the two powers, by which they agreed to carry on the war at the common expense of both: the conquests in Lombardy to be assigned to the Venetians; those in Romagna and Tuscany to the Florentines; and Carmignuola was appointed Captain General of the League. By this treaty the war was commenced in Lombardy, where it was admirably conducted; for in a few months many places were taken from the duke, together with the city of Brescia, the capture of which was in those days considered a most brilliant exploit.