The ‘ashvamedha’ was a ritual used to recognise men as rajas. A horse was left to wander freely.
If it wandered into another kingdom and the king of that kingdom stopped it, they had to fight.
The ‘raja’ who succeeded in the challenge was recognised as stronger.
Final Answer:
Ashvamedha was a ritual where king have to fight with horse if he succeeded in the challenge he was accomplished as stronger.