This paper reports that a large-scale, multinational attempt in Europe to rank humanities journals has set off a revolt. In a protest letter, some journal editors have called it "a dangerous and misguided exercise." The project has also started a drumbeat of alarm in this country, as U.S.-based scholars begin to grasp the implications for their own work and the journals they edit. The ranking project, known as the European Reference Index for the Humanities, or ERIH, is the brainchild of the European Science Foundation, which brings together research agencies from many countries. It grew from a desire to showcase high-quality research in Europe. Panels of four to six scholars, appointed by a steering committee, compiled initial lists of journals to be classified in 15 fields. Each journal was assigned to a category--A, B, or C--depending on its reputation and international reach. The denunciation of the project as dangerous appears in an open letter signed by more than 60 editors of journals devoted to the history of science, technology, and medicine. They also ask to have their journals removed from the rankings. The letter will be published in the first 2009 issues of those journals, which include "Centaurus, Perspectives on Science, Isis, Annals of Science," and "the British Journal for the History of Science".