While his uncle, Nikolaus Graf von Üxküll-Gyllenband, together with Fritz-Dietlof von der Schulenburg, had approached him before to join the resistance movement against the Hitler regime, it was only after the Polish campaign that Stauffenberg began to consider it. Peter Yorck von Wartenburg and Ulrich Schwerin von Schwanenfeld urged him to become the adjutant of Walther von Brauchitsch, then Supreme Commander of the Army, in order to participate in a coup against Hitler. Stauffenberg declined at the time, reasoning that all German soldiers had pledged allegiance not to the institution of the presidency of the German , but to the person of Adolf Hitler, due to the introduced in 1934.