Are There Any Instructions On How To Defend Ourselves Against Aliens?

I searched the internet for an official answer, but couldn't find one for you.   I searched the US Government's website, they only  have help for those who wish to defend themselves against people who they call 'alien' who are foreign nationals.

However, with the discovery of a planet that is very much like Earth, I can see that some people might worry that there is a potential that 'Earth II' might include some 'aliens' who want to attack us.  

Well, you're in luck, because a book has recently been published called 'How to Defend Yourself Against Alien Abduction' by Ann Druffle.  Whilst it might seem ludicrous, people who believe in aliens will find the book interesting enough.

Nonetheless, it appears that it is not as useful as it might seem.  There are nine specific techniques described, but from the examples, it looks very weak.  I advise you to cooperate with the aliens, especially if they have big guns.

Ever since the observations made about our planet, we have incessantly been waiting for the aliens. Or so it seems. The fact that our planet is just a tiny spec in the universe makes it even more luring to imagine life on other planets. Over a period of time, instead of invading the planet, aliens have invaded our films and minds. However, we cannot sideline the evidence of alien presence that has come from all around the world. There have been numerous people who have claimed interactions with aliens. The sightings have aroused much curiosity and the number of 'alien watchers' has increased.

How to defend ourselves against aliens? This question is something aliens should be asking themselves, considering the kind of technology and nuclear energy we have harnessed. Nevertheless, if at all you do encounter an alien, you should probably:
- Avoid physical contact. You can never be too sure about the unknown and what may be the repercussions.
- Try and slither away. Difficult though, it is probably the most sensible thing to do. Think about the antennae and penetrating vision later.
- Do not imagine your conversation would be understood. Save the energy.
- If you are in a group, make some mental notes and recordings.

If you mean aliens that come here then I doubt there is anything you can do if they mean you harm. They have the technology to propel a spacecraft to our planet, I think they can defend themselves against anything we can throw at them.

This is of course working on the assumption aliens do exist and for some reason want to come to our planet which we've half mined already.

Have you come in contact with an alien if not then you should not be worried about defending yourself against one because you have no proof that they are the hostile one if one of these aliens walked up to you, you would probably assert some kind of force towards the alien so to them we might be the hostile one and they would need to defend themselves against us.