相关规则
Sweden
Practice Relating to Rule 129. The Act of Displacement
Section B. Evacuation of the civilian population
Sweden’s IHL Manual (1991) provides:
The only circumstances under which the occupying power has the right to order removal of the civilian population is when evacuation is required to protect civilians from military attack, or when civilian safety otherwise requires this. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 6.1.3, p. 122.