The Chachnāma (Fatḥnāma-yi Sind) 16: Chach leaves his deputy in the fort of Multan and proceeds onward.

16

When he took the fort of Multan he appointed there a thakur as his deputy. He went into the temple, prostrated himself before the idols, and offered sacrifices. He then prepared to march forward. The rulers of Brahmapur, Karur and Ashahar, acknowledged submission to him. From these places he proceeded to the boundaries of Kumba and Kashmir. No king offered any resistance.
"When the Almighty makes a man great he renders all his enterprises easy and gives him all his desires."
Every place to which he went fell into his possession. At last he reached the fort of Shakalha, an elevated place which is called Kumba on the borders of Kashmir, and stopped there for one month. He punished some of the chiefs of the surrounding places, and collected an army under his command. Then he made firm treaties with the chiefs and rulers of that part of the country, and securely established his dominion. He sent for two trees, one of which was a maisir, that is white poplar, and the other a deodár, that is a fir. He planted them both on the boundary of Kashmir, upon the banks of a stream, which is called the five waters, and near the Kashmir hills, from which numerous fountains flow. He stayed there till the branches of each of the trees ran into those of the other. Then he marked them, and said it was the boundary mark between him and the Rai of Kashmir, and beyond it he would not go.