This sounds like two tanks following the lead tank and he was lost. The same thing happened in the US a couple years ago. When all the Mexican Army trucks crossed the border and showed up at our checkpoint, we would find that the Officer in the front truck was lost and all the others followed. We wished them a Buenos Dias and sent them home.
Islamist militants attack African Union base in southern Somalia (Reuters)
from the article: Three Syrian tanks enter demilitarized zone in Golan Heights