Spy operation success is dependent upon the relative strength of your intelligence network as compared to your land area.  Due to  larger countries have more land and resources to maintai, a larger spy network is necessary to gain the same level of effectiveness. However, tiny countries will not be able to consistently use large spy networks to unreasonably destroy larger countries. Spy effectiveness is based upon Spies Per Acre of Land (SPAL)  It is calculated by dividing the total acres one has by the total amount of spies.  This is compared to a targets SPAL, and the success rate is thereby calculated on who has a larger SPAL ratio.  This does not, however, mean that the greater ratio will inevitably be successful each attack, but rather means it will greaten the percentage rate.  Spy effectiveness tech is used in calculating ones SPAL. Spy attacks can be used very effectively, and are a necessary for success in clans.  Using spy military or spy status will aid one in attacking and takes only one turn.  Using stir rebellions is a good and productive way of destroying a given target, for it quickly kills civilians using one turn each time.

Bio Terrorism By releasing biochemical agents into an opposing targets infrastructure, the water and food supplies, you can cause disease to spread throughout their country. Until their medical efforts result in a cure, the plagues will spread and kill people across the land.  This is only needed to be used once until the cure is used.  Doing more will be of no use for the plague is spread only once. Bomb Airbases In this operation, one's agents will attempt to infiltrate the enemy's airbases and destroy stationary jets.  This attack is useful against industrial countries that produce great amounts of jets, and provide threats to one's country defending. Bomb Banks To prevent one's opponents from stockpiling excess cash, one can attempt to bomb the country's central banks and destroy a portion of their money supply. This works exceptionally well when attacking near the conclusion to a round, due to the amounts of cash being stored. Bomb Buildings This operation focuses on destroying a portion of the enemy's structures; this can be very costly to your target in terms of turns wasted rebuilding.  Using this concurrently with artillery barrages will lead to great success on destroying buildings on a given target. Burn Food Stores Similar to bombing banks, burning food stores destroys a portion of another country's food stock, forcing them to not only watch their finances, but their food supplies as well.  This attack is not as effective in killing a country, but rather useful in slowing down farmers, or other countries storing food. Cause Dissensions By discouraging the target country's military, one can try to make a portion of their troops to flee from their standing army.  This is most prominent when trying to kill a target, but have too few troops to do so.  Using this attack will i eliminate the amount of troops owned by the target, thus giving a greater chance of success against. Demoralize By sending one's agents to weaken an opposing countries' military, one may be able to effectively defeat them with a smaller army. The power of a healthy, ready army can never be underestimated.  Using this spy attack on larger targets is useful when attacking with less offense than their defense. Espionage This spy attack will place spies into opposing research lab.  This operation is the only one that physically benefits and thereby if successful, one will capture a small portion of the opponent's technology points.  This is used to prevent stronger targets from both getting stronger and from getting less equally.  Since it will benefit physically, it is a very useful attack both for defensive and offensive purposes. Market Spy The Market Spy allows one to check out how much military a country has on the public market.  This is beneficial because based upon the amounts of defensive military being sold, one can establish efficient amounts to attack with during the allotted time the military is on the market. Military Spy A simple spy operation will give information about total army holdings, yet a more detailed understanding of army brigades and where they are is more useful.  This attack is used to discover the standings of a targets military status for future offensive purposes.  Knowing the status for one's defensive military will aid in planning an attack, as well as aid in possible sudden attacks upon you. Sabotage Intelligence in this operation, using one's spies against a targets directly, in attempt to assassinate or make ineffective as many as possible of one's target's spies, thereby weakening one's defensive position.  Using this is particularly used when eliminating spies from a target country that posed a threat with its spies against you, both offensively and defensively. Sabotage Missiles Ruthless countries often stockpile weapons of mass destruction such as chemical, nuclear, and EMD Missiles. This operation sends one's covert forces out to dismantle as many opponents' missiles as possible. This is enormously helpful in clan wars, for missiles are a large contribution to death.  Using missile protection tech and likelihood of new development techs can lead to greater success with this spy attack. Spy On Alliances This spy attack is used to spy on a targets allies, to have a better understanding of the targets defensive, offensive, research, intelligence, and trade pact allies. This will enable one to make more beneficial attacks due to the sizes of the allies. Spy With this spy attack, if successful, the full statistics are captured and displayed on a selected target.  It is recommend that when attacking, one always does a spy attack first, to better the chances of success.