On what date did Britain declare war on Germany following an " unsatisfactory reply " to the British ultimatum that Belgium must be kept neutral ?
As the historian Fritz Fischer pointed out , this could be proven by Jagow ’s request to know the full itinerary of Wilhelm ’s North Sea cruise before the Austrian ultimatum was presented because : “ Since we went to localize the conflict between Austria and Serbia , we must not have the world alarmed by His Majesty ’s returning prematurely ; on the other hand , His Majesty must be within reach , in case unpredictable developments should force us to take important decisions , such as mobilization .