Answer : 1. "17th November,1913 "
Explanation :

 1. Mangarh Hill situated on the Gujarat-Rajasthan border is also known by the tribal name Jallianwala.

2. On November 17, 1913, a tragedy occurred in Mangadh (Banswara, Rajasthan) in which more than 1,500 Bhil tribals were killed.

3. Guru was a great leader among the Bhil and Garasia tribal communities, a man who united thousands of tribals on his own. The immediate Mangadh covered the border areas of present-day Udaipur, Dungarpur and Banswara of Rajasthan, Idar of Gujarat and Malwa of Madhya Pradesh.