In the case of Steamship Company v. Portwardens, the Supreme Court of the United States was asked to decide whether a steamship company was liable for damages caused by the negligence of its portwardens. The steamship company had hired the portwardens to inspect and repair the ship's hull and rigging, but the portwardens had failed to do so properly. As a result, the ship had suffered extensive damage and the steamship company was sued for the resulting losses. The Supreme Court held that the steamship company was liable for the damages caused by the negligence of its portwardens. The Court reasoned that the portwardens were acting as agents of the steamship company and, as such, the company was responsible for their actions. The Court also noted that the steamship company had a duty to ensure that its agents were properly trained and supervised, and that it had failed to do so in this case. The Court's decision established that a company can be held liable for the negligence of its agents, even if the company did not directly cause the harm. This ruling has been cited in numerous cases since then and has become an important part of the law of agency.

In the case of Steamship Company v. Portwardens, the Supreme Court was tasked with determining whether a steamship company could be held liable for damages caused by its vessel to another ship in an accident that occurred while navigating through a port. The majority opinion found that the steamship company was not liable because it had acted in accordance with all applicable laws and regulations at the time of the incident. However, Justice Field dissented from this ruling and argued that although there were no specific laws or regulations governing such incidents at ports, common law principles should apply which would make the steamship company responsible for any damage caused by their vessel regardless of fault or negligence on their part. He further stated that if companies are allowed to escape liability due to lack of regulation then they will have little incentive to take proper safety precautions when operating vessels near ports as well as other areas where navigation is difficult or dangerous.