Today wikipedia diving taught me about the Cod Wars . https://en.wikipedia.org/wiki/Cod_Wars On 5 September 1972, at 10:25,[58] ICGV Ægir, under Guðmundur Kjærnested's command, encountered an unmarked trawler fishing northeast of Hornbanki. The master of this black-hulled trawler refused to divulge the trawler's name and number and, after being warned to follow the Coast Guard's orders, played Rule, Britannia! over the radio.[3] At 10:40, the net cutter was deployed into the water for the first time, and Ægir sailed along the trawler's port side. The fishermen tossed a thick nylon rope into the water as the patrol ship closed in, attempting to disable its propeller. After passing the trawler, Ægir veered to the trawler's starboard side. The net cutter, 160 fathoms (290 m) behind the patrol vessel, sliced one of the trawling wires. As ICGV Ægir came about to circle the unidentified trawler, its angry crew threw coal as well as waste and a large fire axe at the Coast