Why did people of Kathmandu welcome enemy prithvi Narayan shah after it was captured

The victory in the Battle of Kirtipur climaxed Shah's two-decade-long effort to take possession of the wealthy Kathmandu Valley. After the fall of Kirtipur, Shah took the other cities Kathmandu and Lalitpur in 1768 and Bhaktapur in 1769, completing his conquest of the valley. In a letter to Ram Krishna Kunwar, King Prithvi Narayan Shah was unhappy at the death of Kaji Kalu Pande in Kirtipur and thought it was impossible to conquer Kathmandu valley after the death of Kalu Pande. After the annexation of Kathmandu valley, King Prithvi Narayan Shah praised in his letter about valour and wisdom shown by Ramkrishna in annexation of Kathmandu, Lalitpur and Bhaktapur (i.e. Nepal valley at the time) on 1768-69 A.D. Similarly, Vamsharaj Pande, Kalu Pande's eldest son, was the army commander who led attack of Gorkhali side on the Battle of Bhaktapur on 14 April 1769 A.D.

The Valley Kings brought a large number of Doyas from Indian Plains under Shaktiballabh sardar. During the first assault in 1757, the Gorkhali army killed 1200 enemies, mostly Doyas, but were badly beaten themselves. Both sides suffered heavy losses. As they advanced towards Kirtipur, the combined force of Valley Kings under Kaji Gangadhar Jha, Kaji Gangaram Thapa and Sardar Shaktiballabh brought Havoc to the outnumbered Gorkhalis. The two forces fought on the plain of Tyangla Phant in the northwest of Kirtipur. Surapratap Shah, the King's brother lost his right eye to an arrow while scaling the city wall. The Gorkhali commander Kaji Kalu Pande was surrounded and killed, and the Gorkhali king himself narrowly escaped with his life into the surrounding hills disguised as a saint.

After his conquest of the Kathmandu Valley, Prithvi Narayan Shah conquered other smaller territories south of the valley to keep otr smaller fiefdoms near his Gurkha state out of the influence and control of British rule. After his kingdom spread from north to south, he made Kantipur the capital of expanded country, which was then known as Kingdom of Gorkha (Gorkha Samrajya).