Answer:
That is a secondary source.
Step-by-step explanation:
The source described in the question is a secondary source. This means that it was not written by a soldier who experienced the American Civil War firsthand. Instead, it was written by a historian or someone who researched and interpreted the thoughts and feelings of soldiers during that time.
It's important to differentiate primary and secondary sources when studying history. Primary sources are created by people who lived through the events being studied, while secondary sources are created by people who analyze and interpret those events using primary sources.
In this case, because the source is not written by a soldier and instead provides an interpretation of their thoughts and feelings, it falls into the category of a secondary source.
I hope this explanation helps you better understand the difference between primary and secondary sources in history.