I had an idea for an RP based on us being guerrilla fighters.  The idea is that we settled and uninhabited island and succeeded, the government said, several years later after we were established, that we couldn't do that, and annexed us.  One of the people of the island hit their troops with an IED and they declared us to be terrorists, sending in even more troops.  Now we're trying to drive them away. 

I'll need a co-gm and suggestions on a proper system, as the only dice based game I've run before failed because we couldn't all be online at the same time.  I'll need a system where that doesn't matter.