i support this because Gabriele de Mussis was a first-hand account of something like this happening

Was that battle another attempt to expand the Mongol Empire?

(Gabriele de Mussis) killed many people in HIS village so he was personally affected by Mongols

(Gabriele de Mussis) hurt innocent people as collateral damage in a war that they were not involved in

(Gabriele de Mussis) infected his cities with plague on purpose

use psychological warfare to scare opponents into surrendering

hurled plague-infected bodies over the walls of cities to infect civilians

When they raided cities they were overly aggressive and destroyed them

Kublai Khan was known to be religiously tolerant, and enforced his tolerance in his political policies

They promoted people based on merit rather than the traditional family relations