how does dantes ruin danglars fortune?

Dantes disguises himself as Abbe Busoni. Monte Cristo visits Danglars to receive a credit of five million francs. Danglars must give him the banknotes, for he has bragged of his immense fortune. Monte Cristo takes the banknotes immediately to the bank depleting Danglars funds so that he cannot hold his word to other banknotes. Danglars decides to go to Italy, to retrieve his money from Monte Cristo's firm. He leaves Paris and his wife.