The Antarctic Treaty bans any military activity in Antarctica. To date, Operación 90 is the only documented military land manoeuvre on Antarctic territory.[citation needed] Leal's team departed on six snowcat vehicles from General Belgrano Army Base on October 26, 1965. The main group was preceded by a scouting four-men patrol on a sled drawn by 18 dogs. While the scouts remained at 83º 2" S, Leal and his men reached the geographic South Pole on December 10. They then returned to Base Belgrano, which they reached on December 31. Overall, the mission lasted 66 days.