Hinduism,Cosmos ,Sanatan Dharma.Ancient Hinduism science.
In 8th century A.D. Arab Muslims started attacking India within a few decades of the birth of Islam, which was basically an extension of invasion of Persia.
In order to ward off Muslim invasions across the western and northern borders of Rajputana, Bappa united the smaller states of Ajmer and Jaisalmer to stop the attacks. Bappa Rawal fought and defeated the Arabs in the country and turned the tide for a while. Bin Qasim was able to defeat Dahir in Sindh but was stopped by Bappa Rawal. Some accounts say that Qasim attacked Chittor, which was ruled by Mori Rajputs, via Mathura. Bappa, of Guhilot dynasty, was a commander in Mori army and so was Dahir’s son. Bappa defeated and pursued Bin Qasim through Saurashtra and back to the western banks of the Sindhu(i.e. current day Baluchistan). He then marched on to Ghazni and defeated the local ruler Salim and after nominating a representative returned to Chittor. After Raja Mori named Bappa Rawal his successor and coronated him King of Chittor, Bappa Rawal and his armies invaded various kingdoms including Kandahar, Khorasan, Turan, Ispahan, Iran and made them vassals of his kingdom. Thus he not only defended India’s frontiers but for a brief period was able to expand them.
Bappa Rawal was a devout Shiva ‘upasak’ (worshiper of Shiva ) and became a ‘Yati’ (an ascetic who has full control over his passions).
Wikipedia Link : http://en.wikipedia.org/wiki/Bappa_Rawal#Battles_against_Muslims