This square honors Private First Class Timothy Donnellan (d. 1918), a local resident who died in World War I. Donnellan arrived in the United States from Ireland in 1916 and enlisted in the 69th New York Regiment from which the Army formed the 165th U.S. Infantry of the famous Rainbow Division.
On June 1, 1918, Donnellan's sister, Mrs. Thomas Loonan, received a letter stating that her brother had been killed defending his post on May 30. On the same day, she received a letter from Donnellan, written a few days before his death. He reported that he was in good health and eager to face the enemy. He also reported that his chaplain, Father Duffy, a New York hero and namesake of Duffy Square, opposite of Times Square, was well. In the same batch of mail were letters from Donnellan's friends, attesting that he had fought like a hero and died at his post.