The Japanese were invited by the Germans and Vichy French to use Madagascar to attack the allies. As a result of this invitation the Japanese command dispatched two merchant cruisers and four A-1 class Submarines to Madagascar, they also brought along 8 aircraft and six midget subs.
The Hokoko Maru and her Sisiter ship the Aikoku Maru were over 11,000 tonnes each before their conversion to armed merchant cruisers and came in at about 12,000 after the conversion. On paper that makes these ships bigger than most British and American Heavy cruisers in WWII. Armed with 8 six inch guns and two 80mm anti aircraft guns, plus four heavy machine guns and three torpedo tubes, these vessels held the potential of dishing out a lot of pain on opponents. However their careers did not live up to their lofty promise.
So Anton now that I have scrounged up all the difficult vessels, all you have to do is knock out a couple of cruisers, a couple of destroyers, and maybe a couple of odd ball small vessels. Nothing too difficult for you and Proxie.