Tactics
The first archaeological evidence of horses used in warfare dates from between 4000 and 3000 BC in the steppes of Eurasia, in what today is Ukraine, Hungary, and Romania. Not long after domestication of the horse, people in these locations began to live together in large fortified towns for protection from the threat of horseback-riding raiders, who could attack and escape faster than people of more sedentary cultures could follow. Horse-mounted nomads of the steppe and current day Eastern Europe spread Indo-European Languages as they conquered other tribes and groups.
The use of horses in organised warfare was also documented early in recorded history. One of the first depictions of equids is the "war panel" of the Standard of Ur, in Sumer, dated c. 2500 BC, showing horses (or possibly onagers or mules) pulling a four-wheeled wagon.
Read more about this topic: Horses In Warfare