Hypothetical Battle: British Intervention in the American Civil War - Who Would Win?

Based on the given information, it is not possible to determine which side would possibly win. However, it is worth noting that the Union forces had a numerical advantage, with 70,000 troops compared to the British force of 15,000 and the Confederate force of 34,000. The outcome of the battle would also depend on various other factors such as the terrain, equipment, and tactics used by each side.