Rule 4: Bashing

More than 6 attacks within 24 hours on the same planet count as bashing and are prohibited (the moon counts as a separate planet).
Attacks with espionage probes or interplanetary missiles do not count towards this.

The bashing rule applies exclusively to active players. If the parties are at war, further attacks are permitted.
The war must be declared in the forum at least 24 hours before further attacks.

(both alliances, or the name of the individual player declaring war, must be named correctly in the announcement thread)
A declaration of war can only be directed at alliances, though the declaration itself may be made by an alliance or an individual.

Accepting the war is not required. Wars that are obviously only intended to massively circumvent the bashing rule are prohibited.
Judging this is the responsibility of the relevant moderators and admins.