British Danube Flotillla arrived at Bratislava, Czechoslovakia according to the Weekly Intelligence Summary No. 19 for the week ending 27 August 1921

An item reported the arrival on 2 August at Bratislava, Czechoslovakia [nowadays Slovakia] of the British Danube Flotillla upstream bound. The French officers showed a very noticeable display of coolness probably while resenting the visit.

Source

The National Archives, Kew Gardens, England CAB-24-127-74