Sikhism achieved a series of military victories and created a Sikh Empire in 1799. The Sikh empire had its capital in Lahore, spread over almost comprising what is now northwestern Indian subcontinent. The Sikh Empire entered into a treaty with the colonial British powers, with each side recognizing Sutlej River as the line of control and agreeing not to invade the other side. Ranjit Singh's most lasting legacy was the restoration and expansion of the Harmandir Sahib, most revered Gurudwara of the Sikhs, with marble and gold, from which the popular name of the "Golden Temple" is derived. After the death
Operation Blue Star under the command of Kuldip Singh Brar. The forces had full control of Harmandir Sahib by the morning of 7 June. There were casualties among the Army, civilians, and militants. Sikh leaders Bhindranwale and Shabeg Singh were killed in the operation. The armed Sikhs within the Harmandir Sahib were led by Bhindranwale, former Maj. Gen. Shabeg Singh and Amrik Singh the President of the All India Sikh Students Federation from Damdami Taksal. General Arun Shridhar Vaidya as the Chief of the Indian army. General Vaidya, assisted by Lt. Gen. Sundarji as Vice-Chief, planned and coordinated Operation Blue Star. From the