Knox knew that the Queen Regent would ask for help from France. So he negotiated by letter under the assumed name John Sinclair with William Cecil, Elizabeth's chief adviser, for English support. Knox sailed secretly to Lindisfarne, off the northeast coast of England at the end of July, to meet James Croft and Sir Henry Percy at Berwick upon Tweed. Knox was indiscreet and news of his mission soon reached Mary of Guise. He returned to Edinburgh telling Croft he had to return to his flock, and suggested that Henry Balnaves should go to Cecil.