score:34
Why: Several factors determined the cost-benefit-ratio of war chariot. This ratio changed with different tempo in different regions, as different factors became differently important. To list the most important:
When: As said, the cost-benefit-ratio became worse at different times, also the knowledge of how to counter the typical strategies of chariots perfectly.
However, by this time cavalry was far more effective and agile than the chariot, and the defeat of Darius III at the Battle of Gaugamela (331 BC), where the army of Alexander simply opened their lines and let the chariots pass and attacked them from behind, marked the end of the era of chariot warfare.
Upvote:-1
Didn't Alexander the Great's army make it super easy to defeat war chariots by trapping them and just slaughtering the riders? After that it was supposed that war chariots were useless.