Eventually becoming an agent of the American Anti-Slavery Society, in 1858 Remond chose to travel to Britain to gather support for the growing abolitionist cause in the United States. While in London, Remond also studied at Bedford College, lecturing during term breaks. During the American Civil War, she appealed for support among the British public for the Union and their blockade of the Confederacy. After the conclusion of the war in favor of the Union, she appealed for funds to support the millions of the newly emancipated freedmen in the American South.