The Great War is fought with larger armies and deadlier weapons than ever before, bringing death and carnage on an unprecedented scale to Europe. The bloody Battle of the Somme and the Battle of Verdun fail to break a stalemate on the Western front, and soldiers become increasingly frustrated and demoralised with the war's mounting casualties, poor living conditions and lack of progress. Despite the October Revolution knocking Russia out of the war in 1917, the odds shift against a blockaded Germany with the entry of the United States into the war, and eventually an armistice is signed. The psychological scars of this war would make the public less willing in future to go to war, or trust their leaders. The introductory scene shows soldiers mobilising at the beginning of the war, grossly under-estimating the destructive power of modern warfare. Interviewees include Karl von Clemm, Edward Smout and Cecil Lewis.