Öljaitü undertook an expedition to Herat against the Kartid ruler Fakhr al-Din in 1306, but succeeded only briefly; his emir Danishmend was killed during the ambush. He started his second military campaign in June 1307 towards Gilan. It was a success thanks to combines forces of emirs like Sutai, Esen Qutluq, Irinjin, Sevinch, Chupan, Toghan and Mu'min. Despite initial success, his commander-in-chief Qutluqshah was defeated and killed during the campaign, which paved way for Chupan to rise in ranks. Following this, he ordered another campaign against Kartids, this time commanded by the late emir Danishmend's son Bujai. Bujai was successful after a siege from 5 February to 24 June, finally capturing the citadel.