 Complete the following phrase:  Guido came to his fathers aid during the Rossi War against Ludovico il Moro and was thus declared a rebel by the duchy of Milan. He successfully held the Rocca dei Rossi in San Secondo against a Sforza siege under Antonio del Vasto son of the marquess of Saluzzo, who was killed during the siege. Guido put a price on Sforzas head but the situation soon worsened. He was promised Venetian reinforcements but these were tied down in the 