John McLean, Culbertson v. Steamer Southern Belle…
“ When a steamer is about to enter a harbor, great caution is required. There being no usage as to an open way, the vigilance is thrown upon the entering vessel. Ordinary care, under such circumstances, will not excuse a steamer for a wrong done. A vessel tied to the shore is helpless. No movement can be made by it to avoid an entering boat; therefore, the whole responsibility rests on such boat.It is admitted that where a collision occurs, as the result of uncontrollable circumstances, no responsibility attaches to either party ”
