How about a little reality in this discussion.
If a species capable of extra celestial travel were to choose to invade earth I doubt that we would ever get the opportunity to use weapons of any kind in defense.
Such a species if they desired to take Earth for their own could most likely engineer a human specific virus to wipe out the human population.
If for some reason they decided that humans would make a good slave population (I can’t think of a reason that a so advanced civilization would need slaves) they could engineer a virus to lobotomize we humans making us passive.
It is most likely that the war would be over before we knew we were under attack. We would for all intents and purposes be at their mercy.
There’s some serious suggestions from more than a few diverse sources that something very close to that has been designed to be the case. That implants that render humans passive, compliant slaves at a given future technological switch thrown or signal sent . . . are now likely planted in upwards of 3,000,0000 Americans alone.