To understand transiting Mars in Scorpio it’s easier to just begin with knowing that Mars is action and Scorpio is intense purpose, which combine to mean purposeful action. This is the simplicity of this placement, and quite frankly, the elegance of the placement. And there is a real elegance to this placement.
Mars in Scorpio is not indecisive in transit or natally. It takes action with purpose, intensity, passion, and it is deadly serious about obtaining its desires. And, I do not mean “deadly” in any kind of metaphorical sense. Mars in Scorpio can become literally deadly if the chart itself is afflicted, and/or if the native encounters too much opposition and obstacles to success.
In the negative, this is a controlling transit, and it is demanding. But, generally there is great strength of purpose exhibited during this time, but the intensity here is completely focused on the outcome. Obtaining what is desired. This placement does not have the adaptability of its counterpart Mars in Aries. Aries in cardinal in nature and can change direction when motivated by failure. In short, Mars in Aries, the individual can change strategies to achieve success. In Scorpio, having to change a strategy is often seen as a failure in and of itself. In Scorpio, Mars feels it can only really win one way-the Scorpio way.
In transit, people will become [to varying degrees of course] more combative, purposeful, serious and driven. In short, this is really not the time to pick a hill to die on, unless it is the most important hill of your life.
Upcoming Mars in Scorpio transits:
2018: 1/1/18 to 1/27/18
2019: 11/20/19 to 1/4/20
2021: 10/31/21 to 12/15/21
2023: 10/13/23 to 11/25/23