The Belgenland was a case heard by the United States Supreme Court in 1885. The case involved a dispute between the United States and the Netherlands over the ownership of a ship called the Belgenland. The Netherlands had seized the ship in 1881, claiming that it was owned by a Dutch citizen. The United States argued that the ship was owned by an American citizen and that the seizure was illegal. The Supreme Court ruled in favor of the United States, finding that the ship was owned by an American citizen and that the seizure was illegal. The Court held that the Netherlands had violated international law by seizing the ship without proper cause. The Court also held that the United States had the right to seek compensation for the damages caused by the seizure. The Belgenland case was an important decision in the development of international law. It established the principle that a nation cannot seize a ship owned by a foreign citizen without proper cause. It also established the principle that a nation can seek compensation for damages caused by such a seizure. The decision was a major victory for the United States and helped to establish the nation's authority in international law.

In The Belgenland, the Supreme Court was tasked with determining whether a ship's captain had the authority to detain and search another vessel on suspicion of piracy. In an 8-1 decision, Justice Field delivered the dissenting opinion arguing that such action by a private citizen is not authorized under international law or U.S. statutes and should be considered illegal unless specifically provided for in legislation passed by Congress. He argued that allowing captains to act as agents of government would lead to arbitrary searches without any legal basis and could potentially infringe upon citizens' rights against unreasonable searches and seizures guaranteed by the Fourth Amendment of the Constitution. Furthermore, he noted that if captains were allowed this power it would create conflict between nations since they may have different laws governing similar actions taken at sea; thus creating potential diplomatic issues which are best left up to governments rather than individuals acting alone on behalf of their own interests or those of their employers.