The territory claimed by Manchukuo included the Chinese province of Jehol, and on 21 January 1933 the puppet government proclaimed its annexation. Japanese troops crossed the border on 23 February to added Jehol to Manchukuo. Zhu Qinglan commanded a brigade in the Battle of Rehe (23 February-1 March 1933), but his troops performed so poorly that Zhang Xueliang ordered his arrest. However, Zhang himself was soon after relieved of command. By 12 March 1933, all of China north of the Great Wall was under Japanese control.