The U.S. sent armed forces to assist the withdrawal of Czechoslovak Legions along the Trans - Siberian Railway .
The U.S. to hold key port cities at Arkhangelsk and Vladivostok .
The U.S. sent armed forces to assist the withdrawal of Czechoslovak Legions along the Trans - Siberian Railway , and to hold key port cities at Arkhangelsk and Vladivostok .