Persecuting the people of Madina
Imam Ibn Katheer writes in Bidayah wan Nihayah:
Translation: The reason for the incident of "Harra" is that a delegation from Madina went to Damascus to meet Yazid. When they returned, they related Yazid’s habit of drinking and his other bad habits to their families. The worst among his habit was that he missed Salaat because of wine. For this reason, the people of Madina agreed to break their pledge of allegiance. They declared this near the Prophet's Pulpit in the Prophet’s Masjid. When Yazid came to know this, he sent an army to Madina. The leader of the army was a person named Muslim bin ‘Uqba. The Pious Elders (Salaf Saliheen) have also addressed this person as Musrif bin ‘Uqba. When he entered Madina, he declared the lives of the Madinites and their property as permissible (Mubah) for 3 days, which meant that for 3 days, the army could do whatever they liked with the lives and the property of the people of Madina. Thus, in those 3 days, he martyred hundreds of people. (Bidayah wan Nihayah, Vol. 6, Pg No. 262)
There is Hadith in Imam Baihaqui’s Dalaail Un Nubuwwa:
Translation: It is narrated on the authority of Hadhrat Mugheera (May Allah be well pleased with him) that Musrif bin ‘Uqba looted Madina for 3 days and raped 1000, unwed, chaste daughters of Islam.
It is written in Tabaqat Al Kubra, Vol. 5, Pg No. 66: Muslim bin ‘Uqba attacked Madina with his army. Yazid’s army martyred 700 Hafidh of the Holy Quran, raped 1000 unwed, chaste Muslim women and for 3 days, there could not be any Adhaan and Salaat in the Prophet’s Masjid.