The first thing that Brigadier Chamberlain did was to undertake the safety of the province of Dera Ghazi Khan, his starting piont. He ensured that all the frontier forts had freshly strengthened garrisons as his main column set off from the fort at Taunsa on the evening of March 6th.
Bozdars were observed on the heights as the column advanced but no attempt was made to hinder the 2,500 Punjab Frontier Force. Shots were heard but these were presumed by Chamberlain to be warning shots from those observers letting the tribes know that the British had started out. The column advanced to Sangarh pass and reached it by daybreak. On advancing through the pass, they soon came into contact with more determined resistance as British picquets were fired upon one one sepoy was killed. Soon, Bozdars were seen on every ridge and pinnacle overlooking the defile that the British were using as a route of march. They had also created some light sangars (fortifications) within the gorge to further improve their defences. This exact spot had been used by the Bozdars to halt a Sikh attack some year earlier and so they felt confident of their position.
A frontal assault of what was called the Khan Bund seemed hopeless given the defensive position of the Bozdars, so Chamberlain ordered his forces to coordinate some complicated manoeuvres before striking home. They were to fall back and find easier routes to the heights on which the Bozdars had located themselves. The 4th Punjab Infantry under Captain A. T. Wilde was to find a route up the northern side of the valley and attack from the West whilst the 1st Punjab Infantry under Major J. Coke was to find a route up the southern route. Artillery was used to try to pin the Bozdars in place. The Bozdars had expected a frontal assault (just as the Sikhs had done many years before) and had not anticipated a flanking attack and certainly not a double one.
Coke's 1st Punjab Infantry started to receive a terrible amount of fire whilst trying to advance towards the Bozdar's left flank. Major Coke himself was shot in the shoulder. The Bozdars were alert to the danger of being exposed on their left flank ans so rushed to reinforce it. They were concerned that their sangars and defensive positions would be too vulnerable if Coke's attack succeeded. The British appeared to be persevering with this as the main attack and rushed more guns and the 2nd Punjab Infantry to support Coke. However, whilst this was happening, the 4th had ascended their heights unseen and unopposed. They started advancing along the heights and soon were upon the Bozdars. By the time the 4th Punjab started rolling up the Bozdar flank, the Bozdars had started to retreat. At this point, Chamberlain released the 2nd Punjab Cavalry to finish off those Bozdars on the valley floor by use of their sabres.
The double flank attack was too much for the Bozdars and they fell back in disarray.