On the 11th, June 1939, the Chief Admiral of HN's Admiralty has decided to launch a full-scale war against NAS. Receiving assist from the SAN, who was HN's major enemy less than an year ago, has now formed a Jointed Fleet. The fleet is divided into the Carrier Division and the Battleship Division and headed towards the high seas.

On 20th June, the Carrier Division including HNS Urocolius, HNS Spizaetus, HNS Nightingale II, HNS Kestrel, HNS Nighthawk, SAN Taihounou, SAN Shukuteki, SAN San Diego, SAN Golden Beaches accompanied by a large amount of escorts from both HNS and SAN have launched wave attacks against the NAS fleet. NAS Mitasaki and NAS Toranato's AA batteries were silenced by the fighters from the carriers. While the torpedo bombers keep striking the starboard side of the two battleships, the dive bombers forced the escorts the break away and could not provide any AA support to the two battleships. The two battleships were sunk three hours later. The scattered escort ships were soon sunk one after one. SAN Nemisis and HNS Alsvider has rescued the survivors from NAS after all ships have been either silenced or sunk.

On the 21st, June, 1939, the Battleship Division that was composed of HNS Aurora, HNS Eclipse, HNS Crescent, SAN Scarlet, SAN Goruden Akuma, SAN Dark Eternal, SAN Muteki has ambushed the major naval port of NAS in Krakabola at night. Unprepared for the attack, the port was soon demolished by large calibre high explosive shells. The ships inside the port were also sunk. The dry dock was struck by DE-207 which was loaded with over five tons of TNT. The ship was timed to explode at 0500 on the 22nd, June, 1939. When the crew has escaped to HNS Alecto at 0330, the fleet departed and rendezvous with the Carrier Division on the 25th, June, 1939. And DE-207 has exploded as timed, completely destroying the dry dock of NAS.

The fleet returned to Snowstone safely on 30th, June, 1939. The Admiralty of HN demanded immediate surrender of NAS or further military action will be taken.