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Margolin's 39th Battalion comprised mostly American volunteers. On 19 September 1918, the 38th Battalion and two companies of Margolin's 39th Battalion were assigned the task of capturing both sides of the Umm es Shert ford across the Jordan River and advancing east beyond the Jordan. After the first attempt to gain the ford failed, Jabotinsky's company "was ordered to make the second attempt … and achieve the purpose at all costs." The operation was successful. Margolin's two companies of American volunteers crossed the Jordan and marched to es Salt, where Margolin was appointed commander of the town. General Chaytor, commander of Allen-by's right wing, told the Legionnaires: "By forcing the Jordan fords you helped in no small measure to win the great victory gained at Damascus."