Steamship ss Czar used as troop and refugees transport according to the Weekly Appreciation of matters of naval interest No. 81 for the week ended 3 July 1920

An item reported that the ss Czar left Southampton, England on 6 July bound for Antwerp, Belgium. On board were British troops for Antwerp embarked. At Antwerp was she to pick up 1,500 Russians destined for Libau [Liepaja, Latvia] and from there she was to return to Antwerp with 200 Belgians.

Source

The National Archives, Kew Gardens, England CAB 24-109-4