 Editorials and cartoons in "Action" often asserted that the British Empire needed to prepare for a defensive war against Japan and that war with Germany would put Britain's interests in Asia in jeopardy.Mosley devoted all of the party's efforts to the "Peace Campaign", calling for a referendum on the continuation of the war and advocating a negotiated peace treaty with Germany.The campaign ended after Mosley and many other senior BUF members were interned under Defence Regulation 18B in May 1940.