I have created a new website dedicated to the life and work of Maulana
Abdul Haq Vidyarthi. It is as yet at an early stage of development.
If you read the reports of his missionary activities from 1923 that I have uploaded, you will see how much work he and other Lahore Ahmadi missionaries (such as one Maulana Ismatullah) did in rural areas (for example, around Agra) to prevent Muslims falling into the clutches of the Arya Samaj. Large numbers of Muslims had in fact deserted Islam and become Aryas, who accepted Islam again through the work of the Maulana.
He mentions in these reports that one factor which helped the Arya Samaj was the disrepute of the Maulvis themselves. The Maulana even says that some wicked Maulvis took money from the Aryas to confirm the allegations against Islam which the Aryas were exploiting (meaning that if, for example, the Aryas said that Islam was a religion of violence, the Maulvis would confirm the same).