On March 11, the troops of the Petrograd army garrison were called out to quell the uprising. In some encounters, regiments opened fire, killing demonstrators, but the protesters kept to the streets and the troops began to waver. That day, Nicholas again dissolved the Duma. On March 12, the revolution triumphed when regiment after regiment of the Petrograd garrison defected to the cause of the demonstrators. The soldiers subsequently formed committees that elected deputies to the Petrograd Soviet.