Pisces is the Winter Water sign.
Action based on vision and love
When Mars is in Pisces, people become creative, peaceful and retiring. Actions, fueled by intuition and profound emotions, are visionary and transcendent. Attitudes are compassionate, sensitive, idealistic, imaginative, and sympathetic. This energy supports artistic interests, personal creativity, the need to retreat into meditation and memories, and actions fueled by information from the wise resources of the subconscious mind.
There is emphasis on spiritual faith, mystical interests, issues of remorse and regret, the desire for forgiveness and atonement, a sense of "merging" into contact with the "Divine," and important matters of psychological growth, healing, and therapy.
As if from another world
There is involvement with altered states of consciousness, matters of self-understanding, sacrificial service, work carried on behind the scenes, and a desire for seclusion, isolation, and privacy.
Under stress with Mars in Pisces, people become helpless, hypersensitive, and confused. Responses are neurotic and hysterical. Ambitions turn vague, impractical, vacillating, disorganized. Focus in general is unrealistic, secretive, obsessive ... and in extreme cases, fraudulent and self-destructive.
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Mars in General -- Your Inner Self of Action, Initiative and Self-Assertion ---> In Astrology, Mars represents physical energy, your ability to take action and your instincts for self-assertion and aggression. Mars supports your independence and your ability to set goals and achieve them. It is associated with overt sexual energy and competition in general. The Inner Self fueled by Mars energy knows how to take care of itself, how to get what it wants and when situations call for force and willpower.
What Does Mars Represent in Your Natal Chart? -- What is it ... and why is it important? ---> Mars, fiery red, the favorite prop of science fiction legend, named for the intense, passionate mythological god of war, is the astrological metaphor which symbolizes an individual's capacity to take action, show independence and self-assertion, pursue goals and ambitions, use physical and sexual energy, and exert his force and willpower in situations of competition and conflict.