Not sure what preposition + verb combinations you can use with bridles and horses. Is there a way of figuring these out as a non-native speaker? I feel you can only know after memorizing a couple of examples.
Anyway, the real question is the following:
Is the following grammatically correct?
The bridles were lashing about the horses as the horsemen were trying to escape the King's cavalry.
I am not sure why, but there's something about this sentence that doesn't seem right.