Little House With the Zombie? Learn how to make butter and cheese, etc?
Paint... Dry...
If done wrong, yeah it would be dull. But a good way to fight off other groups is to be the group that has their act together, not just the most violent one. If they had butter and cheese, they could get more groups on their side by offering to trade.
Build a canal between the kingdom and Alexandria. When the fuel runs out, they can still trade with horse drawn barges. Set up another community on Chesapeake Bay, which is not far from Alexandria. There they can learn how to sail, and trade along the coast. Build towers to send morse code signals to the different settlements.
The interesting thing is that it would be sort of a re-boot of the history of the American colonies.