1955: Revolución Libertadora. During the last days of Peronism in power, following a huge purge on its ranks, the Army became the only force inside the military with a majority of officers supporting Perón. This was also the case of the GADA. There was a first ill-fated attempt against the government, led mainly by the Navy, on 16 June, when rebel aircraft launched a series of air strikes around Plaza de Mayo, killing nearly 350 people. In Mar del Plata, the group kept a close watch on the naval base, taking positions on the hills surrounding the port. Eventually, the uprising succeeded on 16 September. This time, the attitude of the GADA officers was hesitant. During the morning of the 19, the cruiser (the former USS "Boise") and five destroyers shelled the group's barracks, already abandoned by the troops. A long-range radar tower and other equipment was destroyed. The commander changed sides shortly after this action.