Activities of pro-Nazi ethnic Germans in the area led to a large flight of ethnic-Czech civilians and especially Jews. Hitler's increasing threats of attacking Czechoslovakia led to full mobilization on 22 September 1938. Many ethnic-Germans refused to follow the Czechoslovak army mobilization order and either ran across the border to Germany and joined Freikorps, continuing cross border raids from there, or established Grün Freikorps units which were operating from Czechoslovak forests, receiving arms and equipment from Germany, and continuing raids against Czechoslovak authorities, Jews and Czechs, up until the German occupation of the Czechoslovak border areas following the Munich agreement.