fallout-4
I'm on a mission from the navigator of the USS Constitution to get a guidance chip back from some scavengers that stole it, however upon speaking to the scavengers they've presented me with the opportunity to instead attack the USS Constitution and then loot it for scrap, or at least use me to attack the USS Constitution and then turn on me so I have to kill them all…
What are the consequences of attacking the USS Constitution?
Sleeping will give you the "Well Rested" state, which increases your experience gain by 10%.
It also allows you to skip time in game so you can wait for Supply Routes to set up for the first time or skip ahead to the daylight for the various daylight perks like Solar Powered (or night time perks like Night Person, if you've gone for those).
They'll destroy as many structures within the settlement and kill as many people as possible. You'll have the opportunity to repair anything that is broken in Workshop mode:
Obviously if settlers die, that's final.
For a duration of time, the happiness level of the settlement will also be impacted. This is especially the case if sufficient damage has been caused to the structures of the settlement to cause a shortage in any resources (power, water, food).
Best Answer
The biggest direct impact to your character is that you will miss out on being rewarded with the Broadsider (A powerful weapon that fires cannonballs. Rewarded to you if you side with Ironsides.)
From a story standpoint, if you side with the scavengers Davies will sabotage the rockets so that the ship will explode. After the rockets explode the ship will remain landlocked and the robot crew will turn hostile. You will then have to storm the boat with the scavengers and defeat Ironsides. Regardless of what dialogue option you choose the scavengers must be defeated to complete the quest.