No Worries! This condition is a little more prescriptive than the others, but still, the same descriptive results apply. Just go through the conditions as you normally would between sessions...
Between each session check each of the conditions below. Go down the list and check each condition for all steadings before moving to the next. If a condition applies, apply its effects.
So if one of the steadings has developed the tag:
Enmity (The steading holds a grudge against the listed steadings.) Then you check based on defences & distance (in rations), or your own judgement whether or not an attack or war breaks out. The size of the respective steadings and their available militia resources will determine the fictional scale of the attack.
Don't forget to update the campaign map :)
The narrative result? You could just make a call as GM on who wins and the aftermath, but I'd rather turn it into a stake question and add it to the campaign front, with suitable dooms depending on whether or not the player characters embroil themselves in the situation!
Hope that helps?