The British decision to dispatch expeditions to trace the courses of the Niger and Congo rivers was driven by two major considerations—strategic worries that the French would displace the British as the dominant European power in the region after the war and abolitionist concerns that the only way to stop the slave trade was to pressure Africans in the interior to turn to ‘legitimate commerce’. Acting on Park’s suspicion that the Niger and the Congo were the same river, officials organized expeditions to explore both of them. The Niger expedition was an army operation, its caravan consisting mainly of soldiers. The Congo expedition was a more scientifically-oriented naval endeavor that initially intended to use a steamship to go upriver. Both expeditions were large, costly ventures, indicating that various British ideological, political, and commercial groups had an interest in their success.