[quote=BrobyDDark]
Actually, the two nations who attacked the other two aren't allies. They just happened to attack one of the other two around the same time. At best, they tolerate eachother just enough that they rarely battle.
[/quote]

We've already covered it. Attack the weaker states, then turn our sights on one another. 

Uneasy alliance, all that good jazz.

>.> There's no such thing as true alliances. Just factions which serve one anothers interests long enough for them to find a weakness and exploit it.