[quote=@Peik]
There's a huge battle and the King dies, away from the Throne. All the sons race to the capital. The party picks a side. 
[/quote]

Or, in the process of being killed by rebels, the Company was sent to secure a stronghold and it was the only part of the King's plan that worked.

It will start with a successful siege, because then the Company has something the other factions want.