• Ghori attacked the fortress of Tabarhinda (Bhatinda), a strategic point for the Chauhans of Ajmer.
• The ruler of Ajmer Prithviraj Chauhan marched to Tabarhinda and faced the invader in the First Battle of Tarain (1191).
• Prithviraj scored a brilliant victory in this battle but failed to consolidate his position believing this battle to be a frontier fight, and did not expect the Ghurids to make regular attacks.
• Ghori was wounded and carried away by a horseman to safety. Contrary to the expectations of Prithviraj Chauhan, Muhammad Ghori marched into India in the following year (1192).
• Prithviraj underestimated the potential danger of the enemy. In the Second Battle of Tarain, one of the turning points in Indian history, Prithviraj suffered a crushing defeat and was eventually captured. Ghori restored him to his throne in Ajmer.
• But on charges of treason he was later executed, and Ghori’s trusted general Qutb-ud-din Aibak was appointed as his deputy in India.

Source: NCERT