Question

What was the impact of the Mongol invasions on the Delhi Sultanate?

Answer 1

The Delhi Sultanate mobilised a large standing army in Delhi as it posed a big administrative challenge.

Alauddin Khalji constructed a new garrison town at Siri for his soldiers. He imposed taxes on land to feed the army at the rate of $50$ percent of peasant's yield. He began to pay the soldiers in cash.
Muhammad Tugluq shifted people of Delhi to Daulatabad in south and thus converted Delhi into a garrison town. He also disbanded the army. He also paid the soldiers in cash.