the underlying causes was when German U-boats sunt an american cruiser filled with american citizens
2. What was the specific cause of WWI?
The Specific causes were when when Germany began to have disputes with russia and finally declared war on them.
3. How did the soldiers react as they went off to war? Why?
The diaries did not specify the feelings of the soldiers but most likely they were excited because of all the false things they have been told about war