Lüttwitz went to Döberitz on 11 March and asked Ehrhardt whether he would be able to occupy Berlin that evening. Ehrhardt said he needed another day but in the morning of 13 March he could be in the centre of Berlin with his men. Lüttwitz gave the order and Ehrhardt began the preparations. It was only at this point that Lüttwitz brought the group known as "Nationale Vereinigung" into the plot. These included German National People's Party (DNVP) member Wolfgang Kapp, retired general Erich Ludendorff and Waldemar Pabst, who had been behind the murder of Karl Liebknecht and Rosa Luxemburg in January 1919 and , the last Berlin head of police in the old Reich. Their goal was to establish an authoritarian regime (though not a monarchy) with a return to the federal structure of the Empire. Lüttwitz asked them to be ready to take over the government on 13 March. The group was unprepared but agreed to the schedule set by Lüttwitz. One factor making them support quick action was that sympathetic members of the "Sicherheitspolizei" in Berlin informed them that warrants for their arrest had been issued that day.