You must throw your enemys away to gain money.
If you have enough money, built a temple to convert enemys into your people.
There are many possibilities to increase your income, just look in the buymenu.
If an enemy is recruited, you can drag them on towers which will convert them into bowmen helping you win the game.
Left mouse button : catch and hold to carry enemys
Arrow Keys : scroll through map
B : buy menu
P : pause Game