Nader entered Delhi with Mohammed Shah as his vassal on 20 March 1739. The person of the Shah was accompanied by 20,000 Savaran-e Saltanati (royal guard), and 100 war elephants mounted by his Jazāyerchi. As the conqueror of Delhi entered, the city's fortification fired their guns in salute. The Persians received a sumptuous welcome in Muhammad Shah's palace. Sa'adat Khan was tasked by Nader to collect taxes from the citizens of Delhi and did his best to please the Shah in an attempt to ingratiate himself with his obsequious behaviour. However, when Sa'adat Khan sought an audience with Nader, the Shah chastised him harshly for not collecting the taxes with satisfactory speed. After Sa'adat Khan's humiliating defeat at Karnal, his open disloyalty to his emperor in the aftermath, his ignominious failure to curry favour with the person he believed was his new patron, forced to rob his own people of their wealth for a foreign invading host, he became burdened to such an extent that he died in Delhi no more than just a few days after his arrival in that city.