Why was the Persian army capable of striking fast?

The Persian army was capable of striking fast due to its highly organized structure, effective use of cavalry, and strategic deployment of light infantry. Their emphasis on mobility allowed them to cover vast distances quickly, often catching opponents off guard. Additionally, the use of well-maintained supply lines ensured that troops could sustain rapid movements without logistical delays. This combination of tactics and organization made the Persian army a formidable force on the battlefield.