you've made a lot assumptions in this thread. "If you make a lot of noise going down the stairs, the burglar will run away!" Will maybe in Borachio land. In the real world you do not have a clue what this intruder wants. He may be just a common thief, or he might be a murderer or sex attacker. Do you really want to risk your personal safety and your families safety on a flimsy assumption? Are you really going to run the risk of giving up your position and alerting a criminal by clumsily running down the stairs or are you going to find the heaviest weapon to-hand and sneak downstairs to investigate? (After phoning the police of course).
I have indeed made assumptions. Perfectly reasonable ones based on experience of being repeatedly burglarized (apparently that is a word, though I don't believe it). Though not recently it has to be said. I have also had one or two (people are often reluctant to claim this as an occupation so I can't be certain - in all but two cases) burglars as acquaintances.
A decent burglar of course won't be heard, so what I'm faced with here is:
1) a rank amateur, more than likely of the teenage variety. And, believe me, such a person is not particularly to be feared;
2) a homicidal maniac intent on mischief. (These are fortunately extremely rare. If you have evidence to the contrary then please present it to me.) No doubt faced with such a person my position may well be hopeless but I shall face such a one fearlessly since what do I have to gain by behaving otherwise?
3) a fiend of the vampire, werewolf, zombie type. (These are vanishingly rare, but, again if you have evidence to the contrary then you should present it here, there, everywhere.) I'm still going to face the bgr fearlessly. There is nothing to fear but fear itself.
4) a sex fiend. After lulling such a one into a false sense of security, I shall bite his nuts off. That'll learn him. (If it is a him. I think it likely it would be.)
NB A good shillelagh is all the weaponry any householder needs. And I've never had to use one.