The American Civil War was possibly won with British made weapons the
Pattern 1853 Enfield.
British companies did supply arms, primarily to the Confederate states, though also to the Union. While the British government declared neutrality, private arms manufacturers in England and Birmingham supplied the Confederacy with rifles and ammunition. This trade was often facilitated by Confederate agents in Europe and British financial firms, who provided funding for blockade runners. The Confederacy, lacking a strong industrial base, relied heavily on these imported weapons to sustain their military effort.