I had a good friend who was really into horses and horse training, but I dont personally know anything about it, do you?
Yes I know quite a bit about horses. They are trained for a variety of different things such as everyday care, and horse racing. 
Yes! Also like they are trained to go over jumps and stuff too!
Yes today horses and usually trained towards sporting pursuits but historically it was much different. 
Right, as in they were used for transportation back in the old days? Like pulling wagons?
Yes that was one thing, they used to be used for transport, doing farm work and they were heavily used in warfare. 
warfare??? I know people rode them but what else did they do in warfare? I hope they didnt get hurt by people
When horses were trained for warfare some horses even contributed in the fighting. One example are armored horses that would trample the enemy. 
Oh my, that sounds awful. I would not want to be one of those soldiers!!
Horses in warfare
The first use of horses in warfare occurred over 5,000 years ago. The earliest evidence of horses ridden in warfare dates from Eurasia between 4000 and 3000 BC. A Sumerian illustration of warfare from 2500 BC depicts some type of equine pulling wagons. By 1600 BC, improved harness and chariot designs made chariot warfare common throughout the Ancient Near East, and the earliest written training manual for war horses was a guide for training chariot horses written about 1350 BC. As formal cavalry tactics replaced the
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