Q: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
The Battle of Marathon was a watershed in the Greco-Persian wars , showing the Greeks that the Persians could be beaten .
A:
The Battle of Marathon was a watershed in the Greco-Persian wars , showing the Greeks that the Persians could be beaten ; the eventual Greek triumph in these wars can be seen to have begun at Marathon .