My first Air Force boss (Lt Col) had two beautiful buckskin horses he kept at the stables on March AFB AL (1984).
One day at work, word came down that they had escaped the stables (again) and were out playing on the flight line.
The on scene security policeman was asking permission to shoot them with his rifle. It would be real bad for a landing or departing aircraft to hit one, but the March AFB flight line was not very active, and we only had a small reserve unit of C124 transports (which weren't flying). Fortunately, the cop was told not to shoot them.
But the boss was ordered to get his ass out there and catch them right away (it was like their 4th offense). He asked me to help him and it seemed like the right thing to do. So we drove over there, but you can't drive your own cars on the flight line. I didn't have much previous experience catching horses on foot on the flight line, and it was really tiring (and like 120* in summer).
The boss was glad for my help as I could run a lot faster than he could. In appreciation, I got to go riding with him at a later date. These horses were not like the old tired ones I rode in the Boy Scouts, they were young and full of themselves and like to run like hell.
Yee Hawww.

If your horses get loose and people get killed, I hope you have good insurance.