This evet happened around 700 BC, burying the riders alongside the chariots is common knowledge by now since it was done quite often.
Most of the time when we unearthed chariots in the past we would find remains of a horse or two but never to this extent.
From what we can tell, people have hypothesized that a great tragedy must have struck the owners of the chariot.
What really happened we can only guess, maybe the chariot ended up smacking into another chariot, maybe the rider was sentenced to death for doing something that he or she shouldn’t have done, we might never know the truth for sure, all that we know is that something must have caused these 4 horses to be buried alive with the chariot in the first place.
According to officials, the area had been pillaged by grave diggers for a very long time now, they went as far as to make sure that everything was taken away, but alas these horse bones and the chariots were all in mind condition when they were spotted.
The body of the rider was allegedly also buried with the chariot but since it wasn’t preserved all that well the wooden coffin and the body have been carbonized for a very long time now, leaving behind but the horses and the chariot to be discovered.