Old Guns Main Story, Minutmen Quest

1. Return to the Castle

2. Speak to Ronnie Shaw at the Castle

3. Gain access to the Castle's armory

Ronnie Shaw told me that the Minutemen's armory was located in the west bastion of the Castle. It still might contain a lot of useful weapons and supplies, if we can find a way in.

Talk to Ronnie and then follow her to general's quarters. Tunnel is blocked and you have to find a way to clear it. It's simple, open Workshop menu and scrap it! Now you can enter The Castle Tunnels. Find locked gate, just wait, Ronnie will unlock it.

Enter the armory, grab Artillery Schematic and then talk to Ronnie.

4. Collect the Smoke Flares

Ronnie Shaw and I managed to get into the old armory at the Castle. It contained schematics and supplies for building artillery, which would be a huge boost to the hitting power available to the Minutemen.

5. Talk to Ronnie Shaw

6. Build and assign artillery at the Castle

Build one artillery unit and assign someone to it.

7. Talk to Ronnie Shaw

8. Follow Ronnie Shaw

9. Head to the target area

10. Throw a smoke flare into the target area

11. Talk to Preston Garvey

I've built and successfully test-fired the artillery at the Castle. I can now call in artillery fire from nearby batteries with the smoke grenades from the Castle armory.

12. Quest completed