Composite Mars

A composite chart is built from the midpoints between two people's charts, so it is one chart for the pair rather than a chart for either person. These readings say what a placement in it stands for in a pair's shared chart.

In each house

Composite Mars in the 1st house: The pair's drive is direct and visible, and it tends to meet the world with energy, initiative and a readiness to get started.
Composite Mars in the 2nd house: Effort goes into building and securing a material base, and the pair tends to work steadily toward money and possessions it can hold in common.
Composite Mars in the 3rd house: Energy goes into short trips, errands and a busy local round, and the pair tends to be quick, restless and active close to where it lives.
Composite Mars in the 4th house: Drive is directed at family and living space, and the pair tends to put energy into making, mending and improving the place it shares.
Composite Mars in the 5th house: Energy flows into sport, play and creative effort, and the pair tends to enjoy challenge and boldness when it takes something up together.
Composite Mars in the 6th house: Effort is channelled into work, health habits and getting tasks done, and the pair often pushes itself to be efficient and productive.
Composite Mars in the 7th house: Drive is felt in the relationship itself, and the two tend to bring out initiative and assertiveness in each other, often through direct push and pull.
Composite Mars in the 8th house: Drive goes into shared resources and into what comes from outside the pair's own work, such as legacies or the other's means. The pair tends to pursue these with persistence.
Composite Mars in the 9th house: Drive is directed at distant destinations and big questions, and the pair tends to be energised by travel, study and testing its convictions.
Composite Mars in the 10th house: Energy tends to go into taking charge of a shared undertaking in public, with initiative, competitiveness and a wish to see results.
Composite Mars in the 11th house: Energy is spent on group efforts and shared campaigns, and the pair often gets going when friends rally around a common cause.
Composite Mars in the 12th house: Drive works behind the scenes, and the pair may hold back its energy, with effort that is private, indirect or slow to surface.

None of this is a verdict. A single placement never describes a whole relationship, and astrology is a tradition of interpretation rather than a body of established fact.