Ed,
There are 9 warmonger variables that change during everything except for unseen scouts.
If a realm has attacked you recently enough, your number will be in one or more of those slots.
If you target has your number (meaning they have attacked first) you can declare.
Kar,
If I was ranked 100,000 and I decided to try and declare war on a realm that was 80,000 the game will note down the current time, and give me an error telling me to pick a different target.
Normally there will be an exception allowing you to downhit in networth as long as it is up in acres. If you have a last-downhit time within 24 hours, you cannot make use of that exception.
The idea is to prevent people declaring on multiple realms until they find one that has more land than them.

