The Atalanta case was a dispute between the United States and France over a ship called the Atalanta. The French government had seized it in 1812, claiming that it was owned by an enemy of France at the time. However, when the vessel arrived in New Orleans after being released from captivity, its owner claimed ownership of it and sought compensation for damages caused during its seizure. The Supreme Court ruled that since there were no laws or treaties governing such cases at the time, any claims against foreign governments must be made through diplomatic channels rather than through U.S courts. This decision established precedent for future cases involving international disputes and set forth guidelines on how to handle them properly under U.S law going forward

In The Atalanta case, the Supreme Court was asked to decide whether a vessel named “The Atalanta” had been lawfully captured by the French during the Napoleonic Wars. Chief Justice John Marshall wrote a dissenting opinion in which he argued that there was no evidence of any hostile act or declaration against France on behalf of Great Britain at the time of capture and thus, under international law, it could not be considered an enemy vessel. He further argued that even if such evidence existed, it would still have been necessary for France to prove their right to seize her as prize before she could be condemned as lawful prize. As this proof did not exist in this case, Marshall concluded that The Atalanta should not have been condemned and its owners were entitled to restitution from France for damages suffered due to its unlawful seizure.