It was June 3, 1984. The 378th martyrdom anniversary of Guru Arjan, the fifth Guru of the Sikhs, was being commemorated when the Indian Army launched a military attack on the holiest Sikh shrine under the strange name of  Operation Blue Star. Why was this day chosen for the attack? It was no coincidence that the day chosen for the attack was a historic day.  Two centuries ago, on the day of Diwali, 1736, the Mughal forces attacked the Golden …