The Delhi Sultanate ( 1206 -- 1526 ) faced nearly annual Mongol onslaughts from 1297 to 1303 when the Doab was sacked .
What is now Pakistan was under continual Mongol occupation .
The Delhi Sultanate ( 1206 -- 1526 ) faced nearly annual Mongol onslaughts from 1297 to 1303 when the Doab was sacked , and what is now Pakistan was under continual Mongol occupation .