He had burst a blood-vessel.

The ground was soft and wet; the weight of the horse prevented her from getting free.

She felt its hoof striking in its death-struggles, and once her shoulder was struck.
Instinctively she buried her face in the mud, and her arms covered her head.
And then she knew no more.
When she came to, she was in the carriage within the gates of Greyhope, and Marion was bending over her.

She suddenly tried to lift herself, but could not.

Presently she saw another face--that of General Armour.