This is a propaganda postcard, depicting Belgium’s Queen Elisabeth, wife of King Albert I, as a nurse, taking care of a wounded and decorated soldier.
Queen Elisabeth (1876-1965), of German descent, was often depicted as a nurse in war propaganda. She was not a nurse, but often visited wounded soldiers in hospitals, and was involved in several peace initiatives.
There is often a fine line between information and propaganda. This especially applies to war postcards such as this one.