Did the horses all dark colours?

Please provide me with more context! I need to know what horses you are referring to in order to answer your question. For example:

* Are you asking about a specific breed of horses? (e.g., "Were all Arabian horses dark colors?")

* Are you asking about a specific group of horses? (e.g., "Were all the horses in the parade dark colors?")

* Are you asking about horses in general? (e.g., "Were all horses in history dark colors?")

Once you give me more information, I can help you find the answer.