After news arrived of the Confederate victory at Bull Run, Yancey attempted to arrange another meeting with Russell, but he was forced to present his arguments in writing. Doyle argues that Yancey blundered badly by extolling the benefits of slavery to the world in general and Britain in particular. In an August 24 response directed to the representatives "of the so-styled Confederate States of America", Russell merely reiterated the previous determination to remain neutral. Critics maintain that the Yancey mission failed to adequately exploit openings presented by Union Secretary of State William Seward's antagonist attitude towards Great Britain or to address British concerns concerning the effect of the war on Great Britain. In late August, with little else to do, Yancey submitted his resignation but, due to the events of the Trent Affair, Yancey did not leave until his replacements, James M. Mason and John Slidell (selected by President Davis in July before he was aware of Yancey's intent), arrived in January 1862. Yancey did make one further attempt to meet with Russell in the wake of the Trent affair, but Russell replied to the delegation that "we must decline to enter into any official communication with them."