At the beginning of 1919, Döblin moved into his new apartment and medical practice at Frankfurter Allee 340 in Berlin. The immediate postwar period was a turbulent time for him—his financial situation was dire, and the death of his sister Meta on 12 March 1919 as the result of an injury sustained during skirmishes between the Spartacists and nationalist troops in Berlin showed how volatile the situation in Germany was in the aftermath of the November Revolution. The years during and immediately after the war also marked Döblin's growing politicization; although he never joined a party he identified with the political left. During this time Döblin wrote a number of satirical and polemical political essays under the pseudonym "Linke Poot," a dialectical variation of "Linke Pfote" (Left Paw), eleven of which were published in 1921 in a volume called "Der deutsche Maskenball" ("The German Masked Ball").