We can deduce that the author choses to write from this perspective because he actually acknowledges himself as part of the soldiers.
If written from the part of a survivor, the story will be more emotional as he might add details of how he was able to survive.
What is In Flanders Fields?
In Flanders Fields is actually known to be poem that was written by John McCrae in 1918. It's a poem that reveals the situation that took place at Flanders Fields during the war.
We see that the author actually acknowledges with the soldiers in battle through his use of "we".
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