Zubdat al-tawarikh 6: Abu Bakr, son of Zafar Khan, son of Sultan Firoz.

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Abu Bakr was placed on the throne with the title of Abu Bakr Shah. After subjugating his enemies, and possessing himself of the treasure and retinue of Firoz Shah, he became all-powerful.
Sultan Muhammad, proceeding from Nagarkot to Samana, proclaimed himself king, and commenced collecting an army. Hundreds of the nobles of Samana and the owners of lands situated at the foot of the hills, acknowledged his supreme authority. Some of the nobles, deserting Abu Bakr Shah, did Sultan Muhammad homage. The Sultan marched well equipped on Dehli from Samana, and by the time he reached the environs of that city, he had collected a body of cavalry to the amount of 50,000 men. On the 25th Rabi’u-l akhir, 791 A.H., he reached the palace of Jahan-numai.
On the 2nd of Jumada-l awwal a battle was fought between the Sultan Muhammad Jang and Abu Bakr Shah, in which the former sustained a total defeat. Crossing the Jumna with 2000 horse, he entered the Doab, and sent back his son, named Humayun Khan, to Samana, with orders to collect an army and join him. He himself continued at Jalesar, near the banks of the Jumna.
A fresh army of 50,000 horse and foot was accordingly raised. In the month of Sha’ban of the same year, Sultan Muhammad marched on Dehli a second time, and again encountered Abu Bakr Shah. But Sultan Muhammad’s fortune being still unpropitious, he was defeated in this battle likewise. “Though you make the dust of battle rise like columns of smoke, yet will your bravery be unavailing, if fortune does not favour you. If the key is not in your hand, no force will enable you to wrench open the door of victory.”
Sultan Muhammad Shah, still continuing at Jalesar, issued orders to the people of Multan, Lahore, and several other places. directing them to kill the dependents of Firoz Shah, wherever they might find them. Accordingly a general massacre and great devastation ensued, roads were closed, travelling ceased, and houses were desolated.
In the month of Muharram, 792 a.h., Prince Humayun Khan marched out, accompanied by several of the nobles, and laid waste the environs of Dehli, but Abu Bakr Shah, despatching a force to oppose him, put him to flight.