Finland began her return journey to the United States on 28 October in an 11 knots convoy with cargo ships Buford and City of Savannah and escorted by armed yachts USS Alcedo SP-166 2 , USS Corsair SP-159 2 , and USS Wakiva II SP-160 2 , and destroyers USS Smith DD-17 2 , USS Lamson DD-18 2 , USS Preston DD-19 2 , and USS Flusser DD-20 2 .