World War 1 began on July 28, 1914 and lasted until November 11, 1918. Differences in foreign policies were to blame, although the immediate cause was the assassination of Austria’s Archduke Ferdinand. The two main sides were the Allies, which included France, Great Britain and Russia; and Germany and Austria-Hungary. In total, 30 countries were involved in the conflict. Italy, once part of the Triple Alliance with Germany and Austria-Hungary, fought on the side of the Allies. Soldiers fought largely in trenches during the war, and thousands suffered from stress, known as shell-shock. The British and French trenches were often squalid, whereas the German trenches were almost luxurious in comparison,…