I've played 28 battles so far and haven't lost a single one. I'm stuck on the 2nd island (Crimson Wind), I need to sail to Debir, replenish my troops, and it's a waste of precious time, which is a shame...:(
On Debir, I encountered cursed ghosts, but they don't seem to multiply when I attack them. Maybe my attack is too weak (1), or maybe there aren't enough ghosts (5)?:confused:

P.S. The first day of the game is still ongoing:)

Ghosts are very picky - to reproduce during a battle, they need only living bodies! Undead, wooden creatures (thorns, dendroids)... and it seems fish - are not suitable for reproduction!

P.S. - I'm already on the 4th island. So far, all 62 battles without losses :)

PS2 - I'm writing this a little later. A small addition - I was wrong to think that you can't drain life from fish and have the ghosts multiply. It turns out you can increase the number of ghosts by draining life from them (sea devils)!!!!