Horses have several ways to defend themselves. They can use their teeth to bite, their front legs to strike out and their hind legs to kick.
Horses are quadrupeds and have four legs. They use their legs to move around, scratch itches, dig holes, touch things, and for defense.
flight - they run away
The horses failed.
They used horses to travel
horses
horses, and ...
run away as fast as they can, they also kick out with there hind legs as defense.
Horses are 'flighty' because they are prey animals, in other words, they are on the menu. Their number one defense is speed, and when in doubt, they run. They can be trained to compensate for this, search 'sacking out'.
defense
Horses, yes.
They used horses for the same reason people everywhere use horses. They made life much easier than without them.
Horses have a 'flight or fight' defense mechanism in their brains. They will either face a situation, or they will run away. most horses choose to run, rather than face their fears.