sentences:  Cavaignac decided to investigate—in his office, with his assistants—and retrieved the secret file, which now contained 365 items.On 4 April the newspaper "Le Siècle" published "Lettre d'un Diplomate", the first of four documents, that were of critical importance in exposing Esterhazy's guilt, and enabled the Dreyfusard cause to regain the initiative it had lost with Zola's conviction.The secret information had been provided by Zola, who had received it from Oscar Wilde; Wilde had gained it from best friend Carlos Blacker, who was an intimate friend of Alexandro Panizzardi.