Editors. "Duke of Savoy signs Treaty of Susa". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16004, accessed 18 April 2014.]
Cardinal Richelieu manages to persuade the Duke of Savoy to sign the Treaty of Susa. By this agreement, Duke Charles Emmanuel permits French troops to pass through his territory on their way to fight in the War of the Mantuan Succession.