Match-made Battles
The match-made battle panel lets you randomly match-up with an opponent of your skill level, or join a team of other players for multiplayer battles. If you want a battle to be ranked or contribute to the clan competition, you must select this option. Click on the battle type icons to specify the kind of battle you wish to fight. Note that it is not possible for a siege battle to be ranked. The auto-team option will find you any match with any number of people to play with and against. The campaign drop-in option will search for a campaign drop-in battle. This feature means that you are willing to play the role of the AI army in another player's single player campaign. If you join a drop-in battle, you will use the units that exist in the other player's AI army and not your avatar or your unlocked units.
Click here to view a video tutorial about this subject.