In Paul Revere's ride, what does the spark struck by the horse's hoof "kindled the topography into flame" anticipate?

What does the author mean when he says this?
** its line 79 and 80 **

thank you so much if you can oblige me.
Answers:
First, when a horse is running at full speed on a hard surface, the impact & scraping can cause a small spark of flame. The lane means that the daring of his ride 'sparked' the colonies to fight for Independence from England.


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