Moon square Mars (orb 1.8°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Moon in Libra in House 12 brings personal dream, play, inner child, childhood imprint, mother figure, mother image, optimism, and inner rhythm into House 12 (retreat, contemplation, long time, and possible confinement), with Libra style (relationship, balance, negotiation, and sense of form); Mars in Capricorn in House 3 brings action, courage, competition, and effort into House 3 (speech, learning, and the close environment), with Capricorn style (structure, ambition, responsibility, and long construction).
Concrete friction: this aspect creates live tension between the inner child, mother image, and Mars: vulnerability, protection, or the need for safety can turn into anger, inhibition, or defense, sometimes through a weak, inhibiting, or castrating mother image. House 12 (retreat, contemplation, long time, and possible confinement) is in friction with House 3 (speech, learning, and the close environment); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.