Battle Nations - Raiding Basics

The #1 benefit I've found of having friends on Battle Nations is being able to mine each other's resources.  Within your own Outpost, you can only mine resources on land that you've expanded into.  However, your friends can mine resources from anywhere in your Outpost, even land that you don't own yet.  Better still, it doesn't cost you anything if you do it right!  Some key items:

• Defenses: Take down (sell) all your defenses!  The campaign will make you build pillboxes, bunkers, cannon towers, etc, but they don't serve any real purpose.  Defenses do not defend against A.I. Raiders, they just make it more expensive for your friends to raid you (not nice).  If you are going after undefended resources, it only takes two basic Troopers to Raid/Occupy.  No point in sending more expensive units and having them tied up on the road.
• Battle Flag:You have to raise your Battle Flag in order to raid or be raided by friends.  Don't worry, only your friends can raid you, so you won't have a ton of strangers in your land all of a sudden.
• Attack: You'll typically only choose this against the A.I., or if you want to mess with your friend.  If you're being nice, don't ever choose Attack for your friends.
• Raid: This allows you "steal" resources from your friend, including from buildings and mines that they've built.  You will receive resources when you win, and it doesn't cost them anything.  No resources are actually taken from your friend's perspective, and any damage you inflict doesn't actually cost them anything.  You can return armies from Raiding much faster and re-raid.  You can typically raid a resource every 4 hours, but you can raid several different resources and stagger it.  As an example, unmined iron will net you 10 iron every 4 hours from raiding.
• Occupy: This allows you to park your army on your friend's resources, and you can regularly go back to collect those resources.  The game will even notify you when they're ready to be collected.  This DOES affect your friend if you Occupy something that they are actively using and can result in a 10x time penalty.  It's best to Occupy resources that they don't have access to yet.  Unmined iron will net you 38 iron every 4 hours from occupying.
• Counter-Attack: After your friend raids your outpost, their armies are available on the boundaries of your territory to counter attack as they withdraw.  If you are trading resources, you should NOT counter attack because it results in actual losses to your friend that they then have to go spend gold and iron to heal.
• Collect: After you raid your friend, be sure to go into your Army management window to collect your guys.  Otherwise they'll get lost in no-man's land forever.

The Battle Nations folks have posted a decent tutorial on how to manage your armies: http://battlenations.com/forums/topic/walkthrough-army-management/