When was the first Martial Law declared in Pakistan?

This question targets a critical juncture in the political and constitutional history of Pakistan.

• The first countrywide Martial Law was declared on 7 October 1958 by President Iskander Mirza, who abrogated the 1956 Constitution and appointed General Ayub Khan as the Chief Martial Law Administrator.
• The other dates represent subsequent military interventions: 25 March 1969 (Yahya Khan), 5 July 1977 (Zia-ul-Haq), and 12 October 1999 (Pervez Musharraf).