I agree with Trill: I am a Sag Sun/ Aries moon / Pluto Conjunct Ascendant in the 1st house and I have Venus in Sag...Also like Tril - I have Neptune in Scorpio (3rd house and Mars in the 6th house)
Combine that with a Jupiter in Scorp and Mars in Pisces and not only will I fight a battle, I will find a way to defeat my opponent in a very unassumming manner - first finding their weakness, then pouncing on them
When I was young, Mars in Pisces was hard to control- it would make me feel so horrible after I stood up for myself- BUT having all that fire and strong water- the Mars in Pisces lent a fair amount of compassion and empathy.
Also like Tril, I don't think anyone would call me weak, diminuitive or indecisive. BUT..that could be due to the other planetary positions that I have in my chart.
My Taurus fiance also has Mars in Pisces - he is very strong- with his Sun conjunct Ascendant in the 1st house and Jupiter in Aries in the 12th. That Mars placement is what aids him in his work (He is a military police officer).
Here is what I found on Mars in Pisces:
Mars is in aversion to its Aries domicile here being in the 12th sign from it. This has the effect of inhibiting spontaneous action and forthrightness of motivation. There is the hint that agnoia is present (because Saturn's joy is in the 12th) with regard to motivations meaning that the native may not be very aware of what drives him/her. Because the 12th represents the unconscious, and Mars is full of energy, they are often restless and find it hard to release their energy directly. This often leads to indecision where there are two or more opposing viewpoints. Some may dislike competetion. However, if they are consciously aware of their intentions, they can be quite adept at hiding their motivations from others. Despite the restlessness associated with this energy, they are often careful of how they express it because it is also the 5th sign from its other domicile, Scorpio. This is a fairly good position for those involved in covert operations like spying or for investigators of crime or the paranormal. They may be talented in more fluid martial arts styles like Tai Chi. According to Ptolemy, Mars is in its own trigon for both day and night while in this sign and is therefore essentially dignified.
In a diurnal chart, the heat and dryness of the day make it more difficult for the impulses of Mars to be contained. This should theoretically increase the restlessness or carelessness of the natives actions indicating a lack of forethought and motivational awareness. There may be a tendency to overreact to emotional stimuli.
In a nocturnal chart, the cool and moist of night help mitigate the impulses of Mars. This is better for decision making processes and self control. Restlessness should be less of a problem theoretically. Physically they may be more coordinated favoring fluid, graceful movements, but with afflictions they may become lethargic.
I have a nocturnal chart and my mate has a diurnal chart (night time birth versus day time birth).
We are both into meditation (he is a taoist and I am more into natural / American Indian spirituality).
I hope this helps
As far as Mars in Pisces and lots of water in a chart- hmm...I do think that would be hard to handle, but once someone is aware of their weakness it can always become a strength.
Dream - Sexually, Mars in Pisces likes to Merge..totally MERGE..meaning it is a big deal for us to "completely fall into our lovers". Where is his Saturn.