Final answer:
World War I soldiers lost their excitement due to trench warfare, high casualties, and the mechanical nature of fighting which made personal bravery irrelevant. The prolonged war led to a dramatic shift in perception from romanticized ideas of war to the harsh reality. A reason not mentioned could include maintained patriotism or adventure despite hardships.
Step-by-step explanation:
Soldiers in World War I gradually lost their initial excitement for various reasons. The appalling conditions of trench warfare, the seemingly endless and undefined duration of the war, and the disillusionment with the reality of modern combat sharply contrasted with the romanticized ideas of war and heroism that many soldiers held at the beginning. Significant events like the Halifax explosion, the Spanish flu epidemic, and the overall horror and tragedy of the war contributed to a profound loss of enthusiasm.
However, one reason soldiers did not lose their excitement for the war, which is not mentioned in the provided text, might include the initial sense of patriotism or the adventure of joining the military, which some may have retained despite the war's hardships. It should also be noted that some soldiers, perhaps due to strong internal beliefs or the human capacity to endure, may have maintained their morale throughout the conflict.