Step-by-step explanation:
Prithivi Naryan Shah was the eldest son and successor of Narbhupal Shah,the king of Gorkha. He was born on 27 Poush, 1779 BS. He is known as the founder of modern Nepal. He was the person who had started unification campaign of Nepal.
He had faced lots of obstacles during unification campaign and they are; unsuccessful invasion of Kirtipur , Prithivi Naryan Shah attacked Kirtipur two times but couldn't win. In that battle, his brother Surapratap Shah lost his left eye and commander Daljit was injured. Along with this he faced or lose many brave and strong people of his trop. But, he wasn't the person who lose the confidence . He was the brave king with strong hope and his theme was to save his country British rule.
Prithvi Naryan Shah realized the need of increasing trained soldiers, supply of provisions, weapons, co operation of people and unity of command so he went to Banaras and collected some arms and ammunition. He also called some Indian weapon experts like; Shekh Jabar and others to train Gorkhali troop. Finally, all the problems and weakness of Gorkhali troop was solved and Prithivi Naryan Shah attacked different Kingdoms and won too. Finally, he unified all small Kingdoms and saved country.