Explanation:

The Battle of Muktsar or Battle of Khidrane Dee Dhab took place on 8 May 1705, following the siege of Anandpur. In 1704, Anandpur was under an extended siege by the allied forces of the Mughals and the hill chiefs.

During the siege 40 men, led by Bhai Maha Singh, Puar Rajput Sikh by caste, son of Shaheed Bhai Mani Singh, Diwan of the Tenth guru and Jathedar of Amritsar during tenth guru, wrote letters of bedava (abandonment of a Sikh from his Guru[12]) to Guru Gobind Singh.
The Battle of Muktsar was the last battle fought by Guru Gobind Singh.

There he wrote Zafarnamah, ("the epistle of victory"), a letter to Aurangzeb.