From the article:
In an effort to minimise future conflicts in the Middle East, the major powers set up an arms embargo after the 1948 war. However, when the Suez Crisis came to a head, France hastily equipped their new ally, Israel, with up-gunned Sherman tanks and brand-new AMX-13 light tanks.
The AMX also known as the AMX-13 mounts a gun as powerful as that of the Panther tank; they achieved this feat with a radical oscillating-turret design. The gun was fixed to the top half of the turret allowing a twelve-round autoloader to feed directly into the rear of the gun. The whole top half of the turret rocked back and forward on the bottom half elevating and depressing the whole weapon system.
While this removed a crew member and made the turret extremely small, it did have drawbacks. The autoloader was slower than a human loader, and once the twelve ready rounds were used, the tank had to retire out of range while the crew spent 15 minutes or more out of the tank reloading it. Combined with its light protection, this led to the AMX being relegated to reconnaissance roles in the 1967 war.