Great News Everyone! PvP is Coming...!

In our ongoing OSR D&D Fallen Empire campaign, players are in the level 4-level 5 range. One player has a decrepit motte-and-bailey castle with a few disgruntled peasants. They have notoriety in the city and there are fewer and fewer residents that are of a higher level. In let her words they are moving up in the world.

At this point they have been quite successful in their shenanigans, ventures and adventures.

But they’re starting to discuss their characters turning on each other... Like, one character has designs on that castle.

MUAHAHA everything is going according to plan!

Have you had / do you have players who eventually decide to go to war against each other?