In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.
Q: William Sawelson (August 5, 1895 October 26, 1918) was a sergeant in the U.S. Army during World War I. He received the Medal of Honor for valor in combat. The medal was posthumously presented to his father Jacob L. Sawelson at Governors Island. Question: What channel separates the island where Jacob L. Sawelson received his sons medal of honor, from Brooklyn? Answer: Buttermilk
A:
William Sawelson August 5, 1895 October 26, 1918 was a sergeant in the U.S. Army during World War I.