Territories.
I've been doing more work on Towns. Up until now you captured them as a source of income each turn and used the money to buy new units. Now they play a more strategic role.
Each town now has territory surrounding it. Hovering the mouse over a town reveals it.
When you capture the town you also capture it's territory.
A sides collective territory is shown by a boarder.
Territories do 2 things. First they give units a bonus in combat if they're in their own territory.
The second purpose is they provide zones for Fog of War. I've implemented night and day cycles, currently 2 turns day and 2 turns night.
During the night enemy territories are blacked out. They are revealed again once a unit crosses into it.
I've updated the hud to show the time of day a long side the turn count. "morning, afternoon, evening, night".
Lastly when a unit is capturing a town and moves off it before its 100% captured then the town reverts to 0% again.