No. 4 (Karachi) Fortress Company
Originally raised from the Karachi Artillery Volunteers on the 1st of April 1902 before becoming the No. 4 (Karachi) Field Company on the 1st October 1920. Became the No. 4 (Karachi) Electrical and Mechanical Company on the 1st May 1925, then the No. 4 (Searchlight) Company on the 10th February 1928 before becoming No. 4 (Karachi) Fortress Company on the 1st April 1933.