The Jallianwala Bagh massacre, involving the killings of hundreds of Indian civilians on the orders of a senior British military officer, Reginald Edward Harry Dyer, took place on 13 April 1919 in the heart of Amritsar, the holiest city of the Sikhs, on a day sacred to them as the birth anniversary of the Khalsa (Vaisakhi day).

In Punjab, during World War I (1914–18), there was considerable unrest particularly among the Sikhs, first on account of the demolition of a boundary wall of Gurdwara Rakab Ganj at New Delhi and later because of the activities and trials of the Ghadarites, almost all of whom were Sikhs.
In India as a whole, too, there had been a spurt in political activity mainly owing to the emergence of two leaders: Mahatma Gandhi (1869–1948) who after a period of struggle against the British in South Africa, had returned to India in January 1915, and Annie Besant (1847–1933), head of the Theosophical Society of India, who on 11 April 1916 established the Home Rule League with autonomy for India as its goal.
In December 1916, the Indian National Congress, at its annual session held at Lucknow, passed a resolution asking the king to issue a proclamation announcing that it is the "aim and intention of British policy to confer self-government on India at an early date".

On 10 April 1919, Satya Pal and Saifuddin Kitchlew, two popular proponents of the Satyagraha movement led by Gandhi, were called to the deputy commissioner's residence, arrested and sent off by car to Dharamsetla, a hill town, now in Himachal Pradesh.
This led to a general strike in Amritsar.
Excited groups of citizens soon merged into a crowd of about 50,000 marchings on to protest to the deputy commissioner against the arrest of the two leaders.
The crowd, however, was stopped and fired upon near the railway foot-bridge.
According to the official version, the number of those killed was 12 and of those wounded between 20 and 30.
Evidence before an inquiry of the Indian National Congress put the number of the dead between 20 and 30.

Three days later, on 13 April, the traditional festival of Baisakhi, thousands of Sikhs, Muslims and Hindus gathered in the Jallianwala Bagh.
An hour after the meeting began as scheduled at 16:30, Dyer arrived with a group of sixty-five Gurkha and twenty-five Baluchi soldiers.
Without warning the crowd to disperse, Dyer blocked the main exits and ordered his troops to begin shooting toward the densest sections of the crowd.
Firing continued for approximately ten minutes.
A British inquiry into the massacre placed the death toll at 379.
The Indian National Congress determined that approximately 1,000 people were killed.
The Jallianwala Bagh massacre, involving the killings of hundreds of Indian civilians on the orders of a senior British military officer, Reginald Edward Harry Dyer, took place on 13 April 1919 in the heart of Amritsar, the holiest city of the Sikhs, on a day sacred to them as the birth anniversary of the Khalsa (Vaisakhi day).
In Punjab, during World War I (1914–18), there was considerable unrest particularly among the Sikhs, first on account of the demolition of a boundary wall of Gurdwara Rakab Ganj at New Delhi and later because of the activities and trials of the Ghadarites, almost all of whom were Sikhs. In India as a whole, too, there had been a spurt in political activity mainly owing to the emergence of two leaders: Mahatma Gandhi (1869–1948) who after a period of struggle against the British in South Africa, had returned to India in January 1915, and Annie Besant (1847–1933), head of the Theosophical Society of India, who on 11 April 1916 established the Home Rule League with autonomy for India as its goal. In December 1916, the Indian National Congress, at its annual session held at Lucknow, passed a resolution asking the king to issue a proclamation announcing that it is the "aim and intention of British policy to confer self-government on India at an early date".
On 10 April 1919, Satya Pal and Saifuddin Kitchlew, two popular proponents of the Satyagraha movement led by Gandhi, were called to the deputy commissioner's residence, arrested and sent off by car to Dharamsetla, a hill town, now in Himachal Pradesh. This led to a general strike in Amritsar. Excited groups of citizens soon merged into a crowd of about 50,000 marchings on to protest to the deputy commissioner against the arrest of the two leaders. The crowd, however, was stopped and fired upon near the railway foot-bridge. According to the official version, the number of those killed was 12 and of those wounded between 20 and 30. Evidence before an inquiry of the Indian National Congress put the number of the dead between 20 and 30.
Three days later, on 13 April, the traditional festival of Baisakhi, thousands of Sikhs, Muslims and Hindus gathered in the Jallianwala Bagh. An hour after the meeting began as scheduled at 16:30, Dyer arrived with a group of sixty-five Gurkha and twenty-five Baluchi soldiers. Without warning the crowd to disperse, Dyer blocked the main exits and ordered his troops to begin shooting toward the densest sections of the crowd. Firing continued for approximately ten minutes. A British inquiry into the massacre placed the death toll at 379. The Indian National Congress determined that approximately 1,000 people were killed.
Amritsar