Raiding player bases is the most efficient means of acquiring resources short of purchasing them with diamonds. To conduct a raid locate the enemy base, chose 'raid'. On the raid screen choose the number and type of troops you want to send. Click 'send'. If your raid is successful, you may seize resources depending on several factors listed below. The amount of resources returned to base is additionally dependent on the carry capacity of surviving troops in the attacking party. Your battle report will detail troop losses and resource gains.
Acquiring resources requires expending a resource raid. Resource raids are accumulated at a rate of 1 raid every 2.5 hours. Resource raids stop accumulating once you have reached 10 until you use one. You may raid a base even when you do not have any resource raids but you will not gain any resources as a result of a win. You also can not send a raid and not use a resource raid if one is available, thus you must pick and chose who you raid wisely. You can view the current number of Raids available at the Command HQ ("Contacts" tab) or on the Map by positioning your mouse on other player's base.
The amount of resources you take from a base for a win is equal to the amount of resources found on the base minus the bunker protection level. At level 20 the bunker protects 18k of each resource. The amount you carry home however is capped first by a rolling weekly raid cap vs single target. This amount is equal to 50k + any resources that base has gained from you either via trade or raid. The amount is further capped by the carry capacity of your surviving troops. Finally there is a 5% "tax" on raids that goes to the bank. In other words if you see 2000 of each resource on a level 1 base you will receive 950 of each resource. This is calculated by 2000 - 1000 bunker = 1000 - 5% = 950. This is assuming you have the carry capacity to take all 950 of each resource.
If you raid a base and the resources on the base are less than the bunker you will receive a small amount of resource as consolation. These resource do not come from the enemy target. You also will not affect any resources the player has stored on resource generator buildings or on convoys. Likewise those amounts will not show up in recon reports.
How To Raid
A Raid can be performed in 3 ways:
Raiding From the Map
Raiding From Within the Enemy Base
Raiding From the Contacts Page
You may raid as often as you like, depending upon how many raid points you have. Raid points cap at 10 after 24 hours of no raiding. Once you raid and the number of raid points is below 10, it will start replenishing raid points at a rate of 1 every 2.5 hours. So, technically, in a 24 hour period you could raid up to 19 times if you started with all 10 raid points and used up the replenished raid points accrued during that time period.
Resource Seizure Limits
You are limited to 50,000 resource points between Rations, Munitions, and Fuel per base raided. If the base you raided receives any resources from you from a raid or any other means, you may raid up to the amount that they took from you, but never to exceed the balance of 50,000 in your favor.
The 50,000 limit on a base is a rotating limit. This means that the limit is based on how much you raided and waiting exactly one week from that time to raid that amount again.
For example: Say you raid a base on Tuesday @ 06:00 for 50,000. You must wait one full week to raid that base again OR unless the balance of that raid amount tips back to that base's favor. This means that the base you raided could raid you back. Whatever the amount that base raided from you, you can raid only that much back. The same applies for any gift in resources you send that sector. You could send that base up to 50,000 in resources each week, same limit as raiding. You can never have a balance of greater than 50,000 in either base's favor.
Now, say you raided that base on Tuesday @ 06:00 for 25k. You then raided again on Wednesday @ 06:00 for another 25k. You could not raid that base again until Tuesday @ 06:00, but only for up to 25k. You can raid for up to another 25k after Wednesday @ 06:00 on that base. If you do not raid Tuesday after 06:00, that sector could be raided for up to 50k after 06:00 on Wednesday.
This definition varies from commander to commander. Farms are bases that put up little to no defense and yield higher amount of resources per raid. Most farms are the result of another commander having quit the game. Thus farms are base that have been abandoned by their cowardly or feeble commanders who no longer wish to fight or dominate our world. Many commanders lay claim to these farms and defend them aggressively from those who would encroach on their sources of income. It is good advice to be wary of where you raid. You might get alot more than you bargained for from that farm you just plundered. The last thing any new commander needs is a powerful and ruthless veteran commander angry at them.
Once you have a farm of your own, so to say, your best course of action is to keep all of its resources to yourself by raiding often. If another commander raids "your farm" and it yields little to no resources, then they are less likely to raid it again any time soon. Just remember that a smart commander recons a base before raiding it.
Trapping and Defending Farms
Some commanders take extra steps to watch over their farms. Once you have successfully raided your farm, invade it with some troops. Most commanders send minimal troop amounts to watch over the farm, such as easily replaceable light infantry, or Recon Drones. This way, if another commander recons or attacks the farm, you will know about it and can take the proper steps to either ensure there are no resources there for the other commander to raid or catch that commander in an ambush with sending massive amounts of defensive troops to wipe out his raiding party. Even bolder commanders will send their own attack force to catch the offending commander off guard once his raiders return to their home base. This is one of the most satisfying things a commander can experience. Wipe out your opponent's attack force and they can't raid again for some time!