Hudson, Point Grace, and Point Marone. Winona fired warning shots eight miles off the coast which were ignored so she opened up with her 5-inch/38 caliber gun after receiving return fire from the trawler. The trawler exploded in a huge fireball after taking several direct hits and sank approximately seven miles off the beach. Winona was struck by several pieces of debris from the explosion, however only minor injuries were sustained by the crew during the action. Action off Nha Trang The trawler designated Khánh Hòa Province Trawler (map reference #2) was first sighted by Market Time aircraft on 29 February approximately 90 miles east northeast of Nha Trang with a southwesterly course. Surveillance was continued by Market Time vessels until she crossed the 12-mile limit 28 miles northeast of Nha Trang. Ignoring warning to heave to for boarding, the trawler continued on towards the beach. A South Vietnamese Navy patrol boat opened fire on the trawler and it quickly changed course and returned fire. Assisted by a U.S. Air Force AC-47 gunship, swift boats PCF-42, PCF-43, PCF-46, PCF-47, PCF-48 and two SVN junks sortied to help the patrol craft chase the trawler to a cove where it ran aground in the Hon Heo Secret Zone At 0230, 1 March, five 81-millimeter mortar rounds from PCF-47 were direct hits and the trawler exploded with a massive explosion due to the munitions aboard. Fourteen dead North Vietnamese sailors were recovered the following morning. Rifles, machine guns and rocket launchers; along with considerable ammunition and explosives were recovered from the sunken trawler. The salvage operations extended over 12 days and included the recovery of a 14.5 millimeter antiaircraft gun and 68 cases of ammunition. Action off Tha Cau River Forty miles from Chu Lai and six miles off the coast, (map reference #3) USCGC Androscoggin intercepted a third trawler designated in U.S. Navy records as the Quảng Ngãi Province Trawler. Androscoggin signaled the trawler to identify itself at 0112 but there was no response so Androscoggin shot 5-inch star shells into the air to illuminate the trawler. It was then that the trawler was positively identified as an SL class North Vietnamese trawler so the Androscoggin opened fire at 0120 with 5-inch high explosive naval gunfire and .50 caliber machine guns. The trawler returned fire with a recoilless rifle, laid a smoke screen and turned into Androscoggin'''s direction but one of the