Final answer:
Based on historical records and warfare conditions, it is true that a soldier's life was often unpleasant, dull, and harsh, with inadequate rewards and brutal living conditions.
This is supported by the experiences during Revolutionary War and the nature of trench warfare.
Step-by-step explanation:
The statement that a soldier's life was unpleasant, dull, and harsh can be considered true based on historical accounts and the nature of warfare.
For instance, during the Revolutionary War, soldiers were not well rewarded for their service, contrary to any notions of glory or adequate compensation.
Furthermore, the conditions soldiers faced were often brutal, with trench warfare in particular being characterized by disease, rats, mud, and hunger.
Technologies of warfare made combat highly mechanized, rendering individual heroism and competence less relevant in the face of indiscriminate killing by artillery and other weapons.
Given such evidence, it is clear that soldiers often led lives that could easily be described as unpleasant, dull, and harsh.