Commodore Pellew is on the Indefatigable in the bottom right corner. He will tell you what to do. Use Z and X to toggle the variables on/off. When an island is occupied by french soldiers, you can bombard the island (shoot cannonballs at it), but each time a cannonball hits an island it is only a 1 in 5 chance it will hit a french soldier. The other option is to land men on the island. To do this, go to island and type how many men you want to send ashore.
Loosely based off the book with the same name by C.S Forester. Thanks to penzorilla for one of the scripts. Update log: Monday, September 16 2013 Added a french-controlled island. Tuesday, September 17 2013 Added an island with 4 french soldiers on it. Wednesday, September 18 2013 Added a third mission, now french ships come and try to take the islands you just conquered over. Sunday, September 22 2013 Added a fleet of small boats that harass you while you are trying to put men on the islands.