Tensions between the royal family and the Ranas came to a head during World War I. The Ranas wanted to join the war in support of Britain, which controlled India to the south.
The prime minister, HH Maharaja Sri Chandra Shamsher Jang Bahadur Rana always had his way with the young king, who eventually ordered the troops to go to war.

By the mid-1930s, popular discontent with the Ranas led to the establishment of several movements, notably the Nepal Praja Parishad, to which Tribhuvan himself gave explicit support, to overthrow the Ranas.
 In each instance, however, the Ranas responded harshly, banning the liberal movements and executing their leadership.

King Tribhuvan worked closely with Praja Parishad to abolish the Rana regime.
In November 1950, King Tribhuvan took refuge at the Indian Embassy in a campaign aimed at removing the Rana oligarchy from power, which had ruled Nepal for more than a century.
He was accompanied by his son Mahendra and the eldest grandson Birendra, among others.
Prime Minister Sir Tin Maharaja, Mohan Shamsher Jang Bahadur Rana became furious and responded to Tribhuvan's move by calling an emergency meeting of the cabinet on 7 November 1950 at Singha Durbar.
In that meeting he announced Gyanendra Bir Bikram Shah, the four-year-old grandson of King Tribhuvan as the new King of Nepal.
In the afternoon, on the same day, Prince Gyandendra Bir Bikram Shah was brought to Hanuman Dhoka Palace and crowned as the king of Nepal.
On 10 November, two Indian planes landed at Gauchar Airport (now called Tribhuvan International Airport) and flew back to New Delhi with the Royal family excluding the infant King, Gyanendra.
King Tribhuvan was formally welcomed by the Indian prime minister Jawahar Lal Nehru and other high officials.
The removal of the king led to huge demonstrations in the country that compelled the Rana prime minister, Mohan Shamsher Jang Bahadur Rana to come into negotiations with Tribhuvan and the Nepali Congress.
On 22 November 1950, Jawahar Lal Nehru, the Prime Minister of India, officially announced that India was not going to recognize Gyanendra Bir Bikram Shah as the legitimate King of Nepal.
When Mohan Shumsher saw that the situation was out of his control, he sent the king's brother-in-law, Sir Kaiser Shamsher Jang Bahadur Rana and Bijaya Shamsher Jang Bahadur Rana to New Delhi for peace talks.
In New Delhi, King Tribhuvan, representatives of Nepali Congress and of the Rana Government all sat together to discuss the situation.
At last an agreement was reached according to which King Tribhuvan to form a new ministry, under his leadership, consisting of the Nepali Congress and the Ranas on an equal basis, King Tribhuvan flew back to Nepal, along with the members of the Royal family and the leaders of the Congress Party on 15 February 1951.
On 18 February 1951, King Tribhuvan returned from India as the monarch.
Three days after the return, Tribhuvan formally declared an end to Rana's family rule and established a democratic system, but Mohan Shamsher continued as a prime minister for a few more months.
Tensions between the royal family and the Ranas came to a head during World War I. The Ranas wanted to join the war in support of Britain, which controlled India to the south. The prime minister, HH Maharaja Sri Chandra Shamsher Jang Bahadur Rana always had his way with the young king, who eventually ordered the troops to go to war.
By the mid-1930s, popular discontent with the Ranas led to the establishment of several movements, notably the Nepal Praja Parishad, to which Tribhuvan himself gave explicit support, to overthrow the Ranas.  In each instance, however, the Ranas responded harshly, banning the liberal movements and executing their leadership.
King Tribhuvan worked closely with Praja Parishad to abolish the Rana regime. In November 1950, King Tribhuvan took refuge at the Indian Embassy in a campaign aimed at removing the Rana oligarchy from power, which had ruled Nepal for more than a century. He was accompanied by his son Mahendra and the eldest grandson Birendra, among others. Prime Minister Sir Tin Maharaja, Mohan Shamsher Jang Bahadur Rana became furious and responded to Tribhuvan's move by calling an emergency meeting of the cabinet on 7 November 1950 at Singha Durbar. In that meeting he announced Gyanendra Bir Bikram Shah, the four-year-old grandson of King Tribhuvan as the new King of Nepal. In the afternoon, on the same day, Prince Gyandendra Bir Bikram Shah was brought to Hanuman Dhoka Palace and crowned as the king of Nepal. On 10 November, two Indian planes landed at Gauchar Airport (now called Tribhuvan International Airport) and flew back to New Delhi with the Royal family excluding the infant King, Gyanendra. King Tribhuvan was formally welcomed by the Indian prime minister Jawahar Lal Nehru and other high officials. The removal of the king led to huge demonstrations in the country that compelled the Rana prime minister, Mohan Shamsher Jang Bahadur Rana to come into negotiations with Tribhuvan and the Nepali Congress. On 22 November 1950, Jawahar Lal Nehru, the Prime Minister of India, officially announced that India was not going to recognize Gyanendra Bir Bikram Shah as the legitimate King of Nepal. When Mohan Shumsher saw that the situation was out of his control, he sent the king's brother-in-law, Sir Kaiser Shamsher Jang Bahadur Rana and Bijaya Shamsher Jang Bahadur Rana to New Delhi for peace talks. In New Delhi, King Tribhuvan, representatives of Nepali Congress and of the Rana Government all sat together to discuss the situation. At last an agreement was reached according to which King Tribhuvan to form a new ministry, under his leadership, consisting of the Nepali Congress and the Ranas on an equal basis, King Tribhuvan flew back to Nepal, along with the members of the Royal family and the leaders of the Congress Party on 15 February 1951. On 18 February 1951, King Tribhuvan returned from India as the monarch. Three days after the return, Tribhuvan formally declared an end to Rana's family rule and established a democratic system, but Mohan Shamsher continued as a prime minister for a few more months.
Tribhuvan of Nepal