But if Pitt did not consider himself indispensable, his friends did, and both he and others came gradually to adopt their view. The rejection of his terms left him free to adopt the line of policy that he had sketched to Grenville in the previous December. He had not to wait long for an opportunity, but in the opinion of Pitt's friends at least the first provocation came from Addington. Unable to strengthen his ministry by any accession from Pitt and his followers, he had turned to the "old opposition," the whigs who, under the leadership of Fox, had consistently advocated a pacific policy. These had recently supported the ministry against the "new opposition," as the followers of Grenville and Windham were called. But since 1797 Fox and the majority of the "old opposition" had generally absented themselves from parliament, and George Tierney, member for Southwark, had led what was left of their party.[15] He now received and accepted the offer of the treasurership of the navy, one of the most important of the offices below cabinet rank. As a speaker Tierney was a valuable addition to the government which was sadly deficient in debating power; he had, however, been particularly bitter in his attacks on Pitt, with whom he had fought a duel in 1798, and had provoked the sarcastic wit of Canning, in whose well-known parody, "The Friend of Humanity and the Knife-grinder" (1798), the original illustration by Gillray depicted the friend of humanity with the features of Tierney and laid the scene in the borough of Southwark. [Pageheading: _CHANGES IN ADDINGTON'S MINISTRY._]