In traditional astrology Mars rules Aries and Scorpio. In our birth charts, Mars works best when we can train its energies instead of just letting it do whatever it wants to do.
Keywords for Mars: assertiveness, energy, aggression, courage, self courage, impatience, passion, & anger.
A well placed Mars gets things done and stands firm. An ill-placed Mars is aggressive and quick to lose control.
Astrologer Robert Hand says, "Nothing exists in nature without the energy of Mars enabling it to survive. Everything maintains its true nature through Mars energy."