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As soon as I reached comparatively level ground I urged my mount into a canter and continued this, where the going permitted, until, close upon dusk, I discovered the point where other tracks joined those of Powell. They were the tracks of unshod ponies, three of them, and the ponies had been galloping.

I couldn't figure out the meaning of it.
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"I urged" = I vigorously encouraged

"my mount" = my horse

"a canter" = a medium pace for a horse, faster than walking, but not as fast as galloping
Comments  
Thank you, Mr Wordy.[F]