I am Carrion the Black Hand, lord of the Ashfields brother to Kaine!! The God king. While Kaine is busy defending against the Sun Empire's holy war, I am planning a naval invasion. The plan is to attack the Sun Empire's Golden Fleet that is anchored off the coast of the Dragon Isles, then land in White Hearth and put it to the torch. The problem is that I do not have much of a fleet to work with and less time to build a larger one. The Golden Fleet will outnumber us three to one and most of my ships are for troop transport. Now I like boarding ships and killing all the crew like everyone else but the Sun Empire know this. They will use smaller ships (Cogs) to shoot at my Galleons then move away before we can hit them, then their own Galleons will come to finish us off.
My son Ivan came to me with a solution to my problem: living in the grey wastes near Cold Harbor is a tribe called the Sea Singers. They are known for taming and riding whales, even riding them into battle with rival tribes. They have answered my call to arms and will soon arrive in Iron Port, with all 500 riders and their War Whales. They will be of great use to me in the battle to come.
I will now hold a war counsel, now my advisers i ask you: What would be the best way to use these War Whales in the coming naval battle?
The War Whales' numbers consist of mostly: Killer whales, Humpbacks. Even some Blue whales and Sperm whales (but only a few of them) and (sigh)...one Narwhal (I will add any cool Whales that get mentioned).
The Sea Singer riders can hold their breath for ten minutes at a time (I can train my own men to hold their breath for three if some need to ride with them (but only Sea Singers can control the Whales), the Sea Singers are also master bowmen and harpooners.
The smiths of Iron Port are some of the best in the world, so we can use them, if the whales need amour or some form of battering ram or better saddles.
I will just point out that there is no magic involved.
The tech level is high medieval 1400 century, steel plates are a thing but gun powder is not on the scene...yet
For more info about Kaine see also: Why Would an Enemy Army Retreat if they Will Die Anyway