INDO-PAK WAR of 1971 December 09, 1971:   On the night of 8–9 December, the Indian missile boats attacked the Karachi port, resulting in further destruction of reserve fuel tanks and the sinking of three Pakistani merchant ships. December 09, 1971:   Pakistani submarine PNS Hangor sank the Indian frigate INS Khukri in the Arabian Sea, resulting in a loss of 18 officers and 176 sailors.