 Complete the following phrase:  The post of Foreign Secretary was generally thought to be beyond his powers. Thomas Grenville, writing to the Marquis of Buckingham, expressed an opinion that he was only put in ad interim until Lord Wellesleys arrival, who is expected in June. Mulgrave, however, showed himself fairly capable in debate. On 11 February 1805 he had to announce the breach with Spain, and to defend the seizure of the treasure ships at Ferrol before the 