After being the Polish military attaché in Paris, Aleksander Kawałkowski became the consul general of a city on what river?
Aleksander Kawałkowski:  From 1934 to 1936 he was a Polish military attaché in Paris and then became Polish consul general in Lille, France. Lille:  On the Deûle River, near France's border with Belgium, it is the capital of the Hauts-de-France region and the prefecture of the Nord department.
Deûle River