Having suffered more than two dozen cross-planet raids (CPR) in my current game, I now see the following:
1) If a CPR comes from a planet directly adjacent to its target, it gathers at the wormhole and then comes through in a sizable clump.
2) If a CPR comes from a planet further away (e.g. three hops away), it gets elongated on the way, and emerges in groups of identical units:
- first the fighters (who are then handily defeated by my bombers)
- then the bombers (who run into massed cruiser fire)
- finally the cruisers (who are massacred by my fighters)
Therefore, the long-distance CPRs are easily defeated.
Short-distance CPRs suffer from the same problem, but much less as there is not so much distance to spread them. But again, I use the above tactic to defeat them.
Both CPRs would be *much* (and I really mean *much*) more effective if they:
- gather at the first wormhole they have to cross until 90% of the total raid is present
- group move towards their target (usually an orbital)
- they will only unclump when they are in striking range of their target
I have also made some suggestions on CPRs in the Suggestions forum