Finished the game in 31 days with Aomori and without using giants. Attack the three islands at the same time, with groups of 25 samurais. The last island will attack you and and you will hold, and at your next turn it will be weaker. Alos build attack cannons in the island. Then attack with the three groups of samurais, the last one fight only against the boss. It is a very easy game, but addictive. =D
The whole game was easy. And the island appeared I easily defended the precctures with groups of 25 samurais and almost no one died in each attack, and with teh same group I attacked the island and didn't lost any battle. The last boss i killed with an army of 25 giants in the first try.