This is a very short answer. Mars is the ascendant of Aries and Scorpio sign. So let us explain in which house mars give good results generally.
Have you heard what the winning houses of a native are?
These are the 3rd, 6th 10th and the 11th.
Whenever a negative/malefic planet, IRRESPECTIVE OF A SIGN, is positioned here, it is bound to give positive results.
So, Mars gives astounding results for the ascendant when it is positioned in the 3rd, 6th 10 and 11th house.
Now a twist in the narration:
For example, Mars is in the 4th house of a horoscope, now this location is 3rd to the 2nd house (positive for it), 6th for the 11th house ( again positive for it), 10th for the seventh house (better for its significations) and 11th for the 6th house( good for 6th house significations)
So, every place for Mars will be beneficial for those houses from where Mars is positioned in the 3rd, 6th, 10th, and 11th house.