Petar Angelov was a delegate of the congress held at Petrova Niva on July 11, 1903, and was appointed leader of the Pirgopol revolutionary region in Strandzha.

During the Ilinden-Preobrazhenie Uprising, he fought battles in Malko Tarnovo and defeated the Turkish troops in the villages of Madzhura, Kurfokoliba and Ineada.

After the end of the uprising, he went back to Bulgaria and from June 14, 1904, he became a leader in the region of Kriva Palanka.

His revolutionary band had 25 members: 14 freedom fighters were born in the liberated parts of Bulgaria, Rudolf Goliyat came from Austria and Anton Hoshek was a Czech.

Petar Angelov participated in the Balkan Wars in the revolutionary band of Yane Sandanski, and later in the third company of the fifth Odrin Battalion of the Macedonian-Adrianopolitan Volunteer Corps in the Bulgarian Army.