Saturn in hard aspect (square, conjunct or opposition) either by transit or in the natal can be very trying on your PATIENCE and your SANITY. The opposition being the most difficult along with the square.
Transiting Saturn Square or Opposite Mars
Out of all the transits, there is not much in terms of "stifling a person" as this one. More than likely while you are going against every odd, your energy will more than likely be very low as well. If that's not enough you will also notice that meanwhile while you're not feeling well, others are becoming more demanding of you. Your workload will pick up and no matter what it is you are trying to accomplish it won't be easy, there will be many obstacles in your way. The funny thing is this transit doesn't care if you are prepared or not. If you have this aspect natally then you have more than likely learned to be very "thorough" in your work since you had to learn the hard way. Saturn will put a hold on all of your efforts. Is it for nothing? No, It's because he want's you to slow down, reassess and learn to be more detailed. If you are in a hurry forget it you will only frustrate yourself. You need to be able to relax and take your time and make sure you dot your i's and cross your t's. By transit Saturn opposing any of your planets has a way of making you feel weak and ineffectual. . The opposition comes in many forms such as technical difficulties, others are not working in cooperation with you, and becoming more demanding of you. You will find it very difficult to keep composer under such frustrating circumstances, but I highly recommend you do.
This is the key to surviving this difficult transit - Don't push yourself, you will burn yourself out...You will probably become ill but definitely frustrated and angry.. You must not act.! go slowly..very slowly..and even try to see what Saturn would rather have you use this down time for? Perhaps to get a better perspective, or get things done that require your time in another area?.Saturn is trying to stop you more than likely for good reason. Perhaps the timing is wrong or there is something else better. However hard it will be, try to understand this, and even if you can't you must. There is no choice in the matter you can't push Saturn out of the way.
Saturn square or opposite mars in natal chart
In the natal chart if Saturn is in difficult aspect to mars you may feel like you always have to work so much harder than anyone else to get what you want. Not just that you feel you do, but you actually do. Things don't come "easy" or "hard" they come harder. Saturn is structure and provides no short cuts, he is also restraint, restrictions and sometimes just plain mean. Your effort is not appreciated unless blood sweat and tears were part of it. Sometimes you are expected to do "much" with absolutely nothing? However, because you had to work so much harder for what you wanted to accomplish, You actually later in life will have a handle on this energy and have more than likely became a "pro" and are quite good and not making mistakes since you know that you don't have the liberty to. People with Saturn in hard aspect to mars become the best at what they do they are thorough in all that they do that you probably won't be able to find fault. This is because they know there are no shortcuts.