In 1466 , the duke of Milan promised to grant the Leventina to the confederates .
Duke was slow to act on duke 's promise , and as the Swiss were tied up in the Burgundian duke he even formed a pact with the Burgundians .
In 1466 , the duke of Milan promised to grant the Leventina to the confederates , but he was slow to act on his promise , and as the Swiss were tied up in the Burgundian Wars he even formed a pact with the Burgundians .