This was a battle that lasted all afternoon long. It seems the smaller paint stallion was fighting the larger white horse for control of a young mare that had just given birth to a still-born colt. There were many bloody wounds when the two finally quit fighting. (Note the blood on the right rear foot of the white).
Pentax K20D
,Sigma 50-500mm Images were shot using a long lens. The mustangs were not disrupted from their normal activities.
full exif