Antislavery agitation spread through reformers with American contacts, but Britain’s movement to abolish the slave trade became the largest social movement of the era. Publishing damning exposés of the traffic, lobbying Members of Parliament, and forming vibrant locals across the British isles, the movement sponsored massive petition-signings that (unlike preceding reform movements) mobilized across social class, while women were also mobilized for boycotting against slave-produced products. The movement only failed to produce immediate results due to a countermovement centered in the slave ports that raised counterpetitions and lobbied for British economic self-interest, particularly once war against Revolutionary France began in 1793.