So, lets see what Mars can do in 3rd house without any conjunction or aspect from any other planet. 1st lets see what these 2 things represent -
Mars represents our will power, courage, ability to take actions, aggressive nature, anger, our fighting ability, brother, male friends, a boy friend for a girl, a soldier, an athlete and real estate etc.
3rd house - It is house of your communication skills, neighbours, short distance travels, younger siblings, marketing, announcements, collecting information, hobbies and skills, self-efforts, business, courage etc.
So Mars, the planet of courage is now coming into the house of courage. What will it make? Obviously, a very courageous person. These are natural risk takers, business man, sports person, athletes and obviously soldiers. They are the most brave of journalists who can go to the war zone itself to cover the news, as 3rd house is house of journalism. As 3rd house also represents communications and Mars represents hands, they are very good with their written communications. They can be very aggressive in their writing. They can motivate people with their blogs or articles. They write very aggressive but very technical language, that's why they can become very good lawyers too.
From 3rd house, Mars aspects the 6th house of disputes and litigation, another reason for them to become a lawyer, communications are impacting disputes and litigation. This is also a great position for having a peaceful married life because this person will go all out to prevent any dispute in his life to save his married life.
Mars next aspect goes to 9th house of teachings of Guru and they try to be better than their Guru. They think, ok, whatever you taught was fine but now I think I can innovate further and make this knowledge better one than what you taught me. So, they will have this aggressive attitude against their Gurus.
Mars next aspect goes to 10th house, and same aggression goes against the authority of father and they try to get the authority from father. But overall, a very good position for a strong willed person who can do anything to achieve on his own.
Hope this helps.
Next - Mars in 4th house.
Vishal S Saxena - Astrologer