Why, only by using the cheapest ship ever, staying out of cannon range, and taking pot-shots at the dust tanks.
Might i remind you that it was easy because it was meant as a tutorial?
No, you may not spoil the fun.
Well, it was meant to be at least vaguely challenging. :D
Commander, Engineering Corps
I tried to cheese the tutorial, and i lost. So it's certainly possible to screw up and died to the final tutorial boss.
My coal ran down to 0, so I grounded my ship on the enemy's dust-tanks.
I'd also suggest avoiding their cannon-range like the plague. Both will kill you dead.
Lieutenant, Engineering Corps
I just boarded it
It can't defend against two barracks