One of the largest mass movements to take place during the whole Partition process was a convoy that originated from Lyallpur. About 400,000 Hindus and Sikhs set off from Lyallpur on 11 Septmeber 1947.
The Balloki Head crossing was the main route for hundreds of thousands of Hindus and SIkhs to cross over to India. The crossing saw some of the most violent attacks on the refugees.
Link to "Partitioned Lives: Narratives of Home, Displacement, and Resettlement"