The first of four campaigns against the territorial ambitions of Filippo Maria Visconti, duke of Milan, was connected to the death of the lord of Forlì, Giorgio Ordelaffi.
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He had named Visconti the trustee of his nine-year-old heir, Teobaldo II.
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Sforza besieged Martinengo, but when Piccinino cut him off from any possibility of retreat the situation looked again favourable to Milan.
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