Venturing out from the safety of your keep, you have to explore the ransacked city at night to collect raw materials, abandoned goods and weapons that you need to survive and hold out long enough for the reinforcements to drive away the attackers.
You need better weapons, a roof over your head, hot food and all the other trappings that just existing entail; and the only way you’ll get these is if you and your team craft them. But resources are scarce and you’ll need to manage them wisely to make it through in one piece.
Defending what’s left of your city are a few tired troops in dire need of arrows, weapons and armour. You need to keep this squad supplied and supported in every way possible ahead of their battles every few days. Not only that, but you have to avoid the enemy soldiers when you go out into no man’s land every night.