When evacuation was effected it would be “to the Great Wall”, not to the Jehol boundary. Since the Great Wall dips well into northern Hopei, an area of several thousand square miles was thus added to the territory of Manchoukuo.…In actual operation, the cordon sanitaire of the “demilitarized” zone was far from reciprocal. Under the terms of the Tangku Truce, Chinese armed opposition to Manchoukuo was clearly prevented.]