Contacted by Connecticut abolitionists soon after the "Amistad" arrived in port, Tappan focused extensively on the captive Africans. He ensured the acquisition of high-quality lawyers for the captives, which led to their being set free after the case went to the United States Supreme Court. With his brother Arthur, Tappan not only gained legal help and acquittal for the Africans, but also managed to increase public support and fundraising. Finally, he organized the return trip home to Africa for surviving members of the group.