This is what Bhai Vir Singh ji said (as I hurriedly scanned it and strictly as I have understood it) in Guru Kalgidhar Chamatkar (vol 2 Chp 70 &72).
After 3 nights of fierce battle at Chamkaur in which 40 odd Sikhs inflicted heavy casualties on the enemy. Now only a handful of Sikhs were left and the end of battle was imminent. 2 elder Sahib zade were already martyred and there was real danger that the enemy would close on Guruji. His Sikhs pleaded with him to leave the area in the interest of khalsa Panth. Because his presence was must for survival of and continuation of Panth. An immediate decision was taken by Khalsa that Daya Singh, Dharam Singh and Maan Singh will accompany Guru ji out of the Chamkaur Garhi from the back side under cover of darkness and that Sant Singh, Sangat Singh, Ram Singh, Kehar Singh, Santokh Singh and Deva Singh would stay back to give Cover to Guru ji and 3 others as they escape and then fight to finish with their lives.
Guru ji finally agreed to this as command from Khalsa. He handed over the Kalgi, his bow and quiver of arrows to but he and 3 others accompanying him donned dark gowns BUT CARRIED OTHER SHASHTRAS with them. As they were leaving the Garhi, Guru ji noticed a few enemy gaurds with flame torches. As alert as ever Guru ji yelled and clapped from a distance that Guru and "Hind Da Pir" has escaped. In the darkness and with dark gown, the guards did not suspect the identity of Guru ji and his followers. Instead they ran towards the Garhi and ran into their own soldiers. In the melee Guru ji got separated from the other three. But earlier he had warned them that in case they got separated they should follow in the direction of a certain star.
As the confusion persisted the remaining Sikhs decided that Sant Singh looked very similar to Guruji and asked him to don his dress and Kalgi. After some time the enemy regrouped and launched the final attack in which the remaining Sikhs got martyred. The enemy came across the handsome body of Sant Singh which looked identical to Guruji. There was much celebration in their camp at this sight. So this gave Guruji much needed leeway.
Now as guruji came out into the clear he sat down to take some rest. Then 2 Gujjar brothers came along and one recognized Guru ji and expressed his amazement. Guru ji asked him to keep quiet but he said he will take his bounty by handing him over. He opened his mouth to yell. Guru ji put his hand on his mouth drew his Kirpan and slew both of them.
I did not come across the expression of Unch Da Pir
Thereafter his journey through Machiwada began.
I am sure this too is not a perfect reproduction of Bhai Sahib's narration. Maybe anyone else who reads this book can do it better.
