Dictionary of Battles and Sieges: A-E: page 113: "Jealous of the Turkish port of Basra, Persian Regent Karim Khan sent a siege force under his brother Sadiq Khan. an Omani fleet broke the blocade but a relief force from Baghdad was repulsed and Governor Sulayman Aqa was finally starved into surrender"
iranicaonline.org
Encyclopedia Iranica: "In 1775 the Wakil sent his brother (Moḥammad) Ṣādeq Khan to besiege Basra in Ottoman Iraq, which after a yearlong siege was taken and occupied until Karim Khan’s death in 1779"
