Princess of Mars ch1 pt6          

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 followed rapidly until, darkness shutting down, I was forced to
await the rising of the moon, and given an opportunity to speculate
on the question of the wisdom of my chase.  Possibly I had conjured
up impossible dangers, like some nervous old housewife, and when
I should catch up with Powell would get a good laugh for my pains.
However, I am not prone to sensitiveness, and the following of a
sense of duty, wherever it may lead, has always been a kind of
fetich with me throughout my life, which may account for the honors
bestowed upon me by three republics and the decorations and
friendships of an old and powerful emperor and several lesser kings,
in whose service my sword has been red many a time.          end of pt6