Or make designated buttons for each banner. The banners that drop down should have two colors, one for joing attacks, and one for defending them. Within these banners are those lists that then get jumbled together if they happen at the same time. An example of this would be war defense banners and banners for regular attacks which are easily hidden behind the first war defense banner. The only difference between the two is a skull(i think). This makes it impossble to differentiate from one banner to the other. So here is the idea-
War banners have an obvious Skull on their primary banner. And the secondary banners will also have a skull always on their button while Attack invites will have a large and obvious sword going along the middle part of the banner(after clicking original pop up) and pointing towards the skull button. The defensive war banner will instead have a shield underneath the skull button but leaving the skull easily recognizable for efficiency.
Atlas primary banners will be signified with a Castle tower/turret button symbol. Again, the differentiation would need to differentiate each banner from others, including war banners!!! In other words no shields and no swords. Atlas is special and therefore should have a special theme. The secondary portion of the attack invites would be marked with an upraise hand pointing onwards (as if commanding an onward march) OR a lance that is used for jousting pointing towards the button. The defensive secondary invites would be much different. Instead of a shield theme we could run with the atlas idea of castles and make the image of a closed outer gate OR two knights crossing their spears initiating the thought of being blocked.
Regular banners for invites should be the most simple of all of these. The primary invite banner could be marked with a sword and/or shield to signify a regular invitation. The secondary invite can have either a sword on the button or a shield on the button, signifying attack and defense invites respectively. The horizontal middle portion of the banner should be blank to be easily skipped over during war waves (unlike war invites with a pointing sword or shield in the middle of the banner with a skull button).
Finally, we have event invites. These should be just like normal invites but instead of the normal coloration they would be lighter in color with a border of some sort to indicate the importance of team placings in events giving better prizes. Maybe even have the word EVENT burning in the middle of the secondary invite.
These ideas are just something i thought would be cool. The general purpose can be understood with the first paragraph. Feel free to make these individualized secondary invite differentiations whatever you wish but please make them easily recognizable as different from one another while in the invite page.