sentences:  He served as an exchange professor to France in 1912-13.At the Hague in August 1914 Wilson aided U.S. Minister Henry Van Dyke to alleviate the distress of American travelers stranded in Europe by the war.He served as Legal adviser for the U.S. mission for return of Dutch ships in 1919 and was a member of the legal staff at the Washington Naval Conference in 1921-22.