"Mars in Sagittarius When Mars in Sagittarius people get angry, they feel like running. They have to do something—not about it, but something else altogether. They don't have a lot of patience to wait things out. This is where the restless and adventurous nature of Sagittarius comes in. People with this position of Mars should seriously consider physical activity as the best means of anger management, if they don't already (naturally) do so. People with Mars in Sagittarius generally have a number of projects going at once. They are not known for their follow-through, however! They start up new projects, however, with admirable gusto. Their vision and optimism can get in the way of completing what they start—they want to do so much, and they trash things too easily when a new idea takes hold. Most of the time, Mars in Sagittarius is playful and fun-loving. They love friendly debates, although they can go to extremes. Some take it personally when you don't agree with them—why wouldn't you agree, after all? Well, for one, you might (especially if you have planets in Virgo or Gemini) find plenty of holes in their arguments. The thing is, more often than not, they haven't thought things through, yet they're very passionate about what they believe in. Mars in Sagittarius loves to "wing it"."

- http://www.cafeastrology.com/articles/marsinsigns_pg2.html