The mood of the people living in Europe at the onset of WWI was mixed. Many people were optimistic and believed that the war would be over quickly, while others were anxious and fearful of the impending conflict. There was also a sense of pride and patriotism, with people eager to defend their countries and show their support for the war effort. At the same time, there were many who were ambivalent or opposed to the war, either because they were pacifists or because they felt that the conflict would bring only destruction and suffering. Overall, the mood was complex and varied, reflecting the complex political and social realities of the time.