For an amazing source of WWI information, check out the World War I Document Archive. This is an impressive collection of official and unofficial documents, ranging from President Wilson's inaugural address to memoirs of ambulance drivers on the front, of which the following is an excerpt:

  On arriving at Nancy I was met by Salisbury, our Section leader, and after a very good meal in the most beautiful little town you could hope to see (and where the Kaiser and ten thousand troops in dress parade were waiting on a hill close by to enter in state last October), we started by motor for Pont-à-Mousson. Some fifteen kilometres farther on, our lights were put out and we then entered the region under shell fire. It was a funny feeling listening to my conductor talking about how this shell and that shell hit here and there; and all along the route we passed torn-up trees, houses, and roads. At last we came to Pont-à-Mousson, a dear little village with about eight thousand inhabitants, and felt our way, so to speak, in the darkness and silence to the barracks which are now the Headquarters of the Ambulance. I found that there were about twenty cars and twenty-two men here, the latter all enthusiastic about their work and the help the Section were giving the French. The day before I arrived a shell hit the house next door, and on first sight one would think it was the barracks itself which had been hit. These huge high-explosive shells are sent into the town every two or three days, and everywhere one sees masses of brick and stone, all that remains of houses struck. The Germans have bombarded the town over one hundred and ten times.