The Mars-Lilith square creates strong tension between the impulse to act and the dark side of anger, desire, and struggle. Mars wants to protect, achieve, move, win. Lilith strengthens resentment, fear of humiliation, sexual hunger, thirst for power, revenge, and the temptation to strike first. The person may remain peaceful for a long time, but one trigger can switch on a wave that is hard to stop.
Interpretation