After Entente forces had breached Bulgaria's defensive line at Dobro Pole on 18 September 1918, the retreating and deserting Bulgarian troops organised an uprising (known as the Vladaya Uprising) against the current government and Tsar Ferdinand of Bulgaria. The rebelling soldiers reached Kyustendil and Radomir and threatened the capital Sofia. In an attempt to stop the uprising, Daskalov and Stamboliyski were promptly released from captivity and envoyed to the insurgents. It was hoped that due to their popularity, the agrarian leaders would be able to persuade the insurgents into obedience.