I could have written this-because it happened to me:
From Grim at Blackfive:
When I first started to ride horses, I would get up on them without any sense that it was a dangerous thing to do. We'd go running through the forest free and easy. The first time I was thrown wasn't enough to lose that sense; it took nearly being killed, not once but three times, before the reality of what I was doing set in. That shook me up, I am not afraid to tell you. There was a time, months, when I could hardly sit a horse at all -- and no matter what I did, no matter which horse, it would spook or bolt when I got on it.
Go to Black five:
Horses and Heroes
Montana Horse Drive
You all know how much I love HORSES!!
WAR MOVES-from War Training to Art Form--
Don't Mess With Horsemen or Horse Women