After the death of Mirza Ghulam Ahmad, Noor-ud-Din was unanimously elected as his first successor. Among his achievements as Caliph were overseeing a satisfactory English translation of the Qur'an, the establishment in 1914 of the first Ahmadiyya Muslim mission in England and the introduction of various newspapers and magazines. After becoming Khalifa, he personally took part in two successful debates at the cities of Rampur and Mansouri. He sent various teams of scholars from Qadian to preach the Ahmadiyya message, to deliver lectures on Islam and hold sessions of religious discussion in numerous cities within India, which proved to be very successful for the community. These teams often included Khwaja Kamal-ud-Din, Mirza Mahmood Ahmad and Mufti Muhammad Sadiq.
