1935: Sikhs Demolish Shaheed Ganj Mosque

Shaheed Ganj Mosque originally named the Abdullah Khan Mosque
on the night of 7 July 1935 the Sikhs demolished the mosque, minutes of British India Privy Council say "by or with the connivance of its Sikh custodians",
Sikh rule began in 1762, the Gurdwara Bhai Taru Singh was built afterwards within the same grounds. The mosque site was under dispute during British rule, but was demolished by Sikhs on the night of 8 July 1935

The judgement of Bombay High Court on 2 May 1940 on 'Masjid Shahid Ganj Mosque vs Shiromani Gurdwara Parbandhak' recognized the building as a Mosque but maintained that the Statute of limitations has passed since the property has been occupied by the Sikhs for more than 170 years.[

Shahid Ganj was a mosque till 1799, till Sikh Army under Maharaja Ranjit Singh captured the city defeating Afghans. "A unit of Sikh Army camped in the mosque and soon converted it into a gurdwara [Sikh place of worship],"
https://www.aa.com.tr/en/asia-pacific/legal-parallel-pakistani-gurdwara-versus-india-s-babri-mosque/1614288