Willem was offered the chance to attack and possible capture some land. If it were any other place he would have had to have more time. But this was a sea based civilization, and Willem was ready for any instance of sea based combat. 
"I'll send a Raven for more ships, a fleet will meet us half way and provide naval assistance along with ranged land assistance" He nodded before boarding his own ship and letting a Raven free with a note attached to its leg telling of the plan. He turned to face Brutus before calling
"Lay on, Banquo!" and waiting for the king to begin the journey.