Archers of Nand - How to play

About Archers of Nand, from BoardGameGeek:

The Valley of Nand is being overrun by wild hordes of orcs. While the local warriors are losing the hand-to-hand battle, the archers of Nand are taking advantage of the height of their mountains to decimate the enemy troops. In this game, you'll have to decide how to protect the valley through the combined action of the warriors and archers of Nand before the orcs destroy everything! Archers of Nand is recommended for ages 10 and up, 1 to 2 players, and games of 20 minutes. Playing this game you will learn the basics of computer databases (the Nand Valley represents a small data TABLE where you will SELECT its regions to attack the orcs). -description from the publisher