Planetary invasion is the military method of capturing a planet. In order to execute a planetary invasion, a troop transport is required. A troop transport is a ship that has troops modules. To initiate the invasion, move the troop transport onto the planet. No invasion can take place if there are any enemy ships in orbit. Once the invasion begins, an advantage factor is calculated for both sides of the ground war. This number takes into account various factors, including quality of the soldiers, their courage, planetary defenses, and technology level. The invading force gets a 5 point advantage due to air superiority. The invading force can choose their preferred invasion tactic, which also affects the advantage factor. After all the choices are made, the potential advantage factors are d