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Airplanes probably ended trench warfare because they could fly over enemy camps, fire down on them, and gather information about troop arrangements. Source: My social studies teacher (a little) and my inference...
A primary source would be from someone who was actually at the battle, while a secondary source would be from someone who had heard about the battle or wrote about it, but wasn't actually at the battle.
If you are reading the actual letter, or an exact quote from that letter, it is a primary source.
our mom told me
How reliable is black adder as a source of information about the ww1 trenches?