He used the units he had at his disposal, in this case the units whose headquarters are in Santiago (the Academy, the Buin Regiment and the Tacna Regiment). Souper used some troops from the Batallón Blindado 2. Prats approached La Moneda, where the tanks were waiting, with the Academy troops, but later it was the Tacna who made Souper surrender and the Buin arrived later as reinforcements.