Meanwhile, the Gorkha King Prithivi Narayan Shah was in is campaign to conquest all the hilly kingdoms into his Empire. He attacked Limbuwan in two fronts. After the Limbuwan Gorkha War 1771-1774 AD, the Limbu ministers of Morong, and Limbu rulers of the ten principalities came to an agreement with the King of Gorkha. With the Limbuwan Gorkha treaty of 1774, Limbuwan was annexed to Nepal.
Limbuwan was attacked several times by Sikkim after 1774 AD. Battle of Morong during the British Gurkha war took place in Morong. Limbuwan was divided into present day administrative districts in Panchayat era by King Mahendra. Taplejung, Ilam, Panthar and Morang was named after their original names, whereas names of the other districts in Limbuwan were Hinduised.
