Redeployments like this (moving or assigning Guards to vassals) are handled through the change role option of the recruit's own conqueror submenu. Interact with the recruit you'd like to make guard your vassal.
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When this sub menu pops up, click on Change Role and choose "guard." (If this recruit is already a guard in your outpost, still choose "guard".) It should then ask you via another pop up what settlement you would like this recruit to guard. Choose the vassal in need.
Give it a second or two. The menu pictured above should then pop back up. You should now notice that this recruit's Role is Guard and base is Vassal: the vassal you chose. This is to confirm your changes. Then hit Close Menu.
The next thing I usually will do is then enter and exit workshop mode to speed up/force the Conqueror HUD to update to reflect the change. When changing roles within an Outpost it is possible that the HUD will briefly show both the old role and the new role. This is just an indication that it's doing its thing and reporting
mid process. Give it a second or two to register the changes correctly,
If you are like me, you might now be inclined to rush over to the war desk to check the Vassal's settlement report. The report should show that your guard count at the Vassal has gone up. At this precise moment, it may or may not, however, accurately report the correct or expected change in Control. Why?
Scripts be working. You've made changes at two settlements: Departure settlement and destination settlement. The
report may not update correctly until you have visited and reloaded the cell of the vassal where you sent the new guard. This is where both patience and trust in the system comes in handy. The former is hard; the latter, saintly.
