In City Siege: Faction Island, you can build your army with tanks, guns, spies, flame tanks, and airplanes.
You'll start your first mission with just one soldier, but you'll soon be able to recruit more soldiers and put together your army however you think is best for each task. During the most dangerous tasks, you will be accompanied by tanks, flamethrowers, planes, and many other dangerous tools. Take part in timed, stealth, or tactical combat missions on maps with environments that can be destroyed, and put together the best army you can based on the units you have and what the task is on the ground.
Have fun and good luck!