Passage: In 1025 and 1026 Gangga Negara was attacked by Rajendra Chola I of the Chola Empire, the Tamil emperor who is now thought to have laid Kota Gelanggi to waste. Kedah—known as Kedaram, Cheh-Cha (according to I-Ching) or Kataha, in ancient Pallava or Sanskrit—was in the direct route of the invasions and was ruled by the Cholas from 1025. A second invasion was led by Virarajendra Chola of the Chola dynasty who conquered Kedah in the late 11th century. The senior Chola's successor, Vira Rajendra Chola, had to put down a Kedah rebellion to overthrow other invaders. The coming of the Chola reduced the majesty of Srivijaya, which had exerted influence over Kedah, Pattani and as far as Ligor. During the reign of Kulothunga Chola I Chola overlordship was established over the Sri Vijaya province kedah in the late 11th century. The expedition of the Chola Emperors had such a great impression to the Malay people of the medieval period that their name was mentioned in the corrupted form as Raja Chulan in the medieval Malay chronicle Sejarah Melaya. Even today the Chola rule is remembered in Malaysia as many Malaysian princes have names ending with Cholan or Chulan, one such was the Raja of Perak called Raja Chulan.

Question: In order to stifle the efforts of enemies, Vira Rajendra Chola made the decision to do what?
put down a Kedah rebellion