My partner has Mars in early Aries square his Saturn in late Sagittarius. People in this aspect try to find a respectable way of harnessing that warrior energy, and the "soft" aspects mean that they don't feel conflicted in doing so, while the hard ones mean that they feel some kind of repression in doing so. 

He's also a guitarist, so I dare you to do this: check the chart of any guitarist, alive or dead, that you know, and you will see Mars-Saturn pop up, indicating this drive. The only guitarist I've found so far that hasn't had this aspect is Jimi Hendrix... always the exception to any kind of rule. 

Mars in Leo on the Midheaven in my chart and it is governed by a Sun Saturn conjunction - a long and successful career building guitars.

Mars and Saturn are great allies - energy harnessed for a purpose. Look at the whole chart to understand how a harnessed Mars enhances your purpose.

My husband has Mars and Saturn in aspect and he was a Green Beret. He is profoundly disciplined, a career soldier.

I also have the planets in aspect; quite wide but still.  My ability to persevere is pronounced.

I heard an astrologer with this aspect refer to the pandemic isolation as “training time.” 

I have Mars Saturn conjunct in Scorpio in my 12th house. It opposes my Moon Mercury conjunction in Taurus, so that may add a little flavor here.  I've been a distance runner since I was 11, pushing myself to the point of injury over and over in an effort to get better. When I was 13 I tried running through a femoral stress fracture but my coach called me out for limping and I ended up on crutches for two months. I was very slow to mature, both physically and emotionally, and my family never practiced talking about emotions (though there was a lot of yelling, hitting, no back talk etc.). Two steps forward one step back feels apt for mars saturn. I hate fighting (7th h stellium), which backfires on me bc I will have a disproportionate response to arguing at a certain point bc the anxiety about fighting makes me upset on top of the argument itself (that infamous mars saturn burst). I can be quite stubborn but have incredible focus and drive when others are relying on me (12th h), and put in a ton of effort behind the scenes. I'm still trying to understand my gut feelings; I rationalize situations to try to make logic of them instead of just trusting. I have hidden enemies (family scapegoat, took until after my saturn return to understand that, we are now estranged) and am pretty sensitive to not making more but then those gut feelings can be stronger than my logic.

I'm with Bruce Lee on praying for strength.  My heavy saturn aspects make me look back at my words, my thoughts, my actions, and cringe and feel thankful for what I have learned. It took a long time for me to even start writing here because I will probably see this later and cringe. Scorpio rising tendency for secrecy doesn't help either. Pretty sure people see through to my 12th house much better than me anyway, at least before my saturn return!