The Sherman M-50 and the Sherman M-51, both known abroad as the Super Sherman, were modified versions of the American M4 Sherman tank that served with the Israel Defense Forces from the mid-1950s to early 1980s. The M-51 was also referred to as the Isherman (i.e. Israeli Sherman). However, the designations "Super Sherman" and "Isherman" were never used by the Israeli Defense Forces.
In 1953, an Israeli delegation visited France to examine the new AMX 13 light tank. The tank was armed with the high-velocity 75 mm gun CN 75-50. While the gun was satisfactory, the armor of the French tank was considered too light. Eventually, Israel did purchase the AMX 13, however in a parallel development it was decided to graft the powerful French gun onto the available, familiar and better-armored hull of the American M4 Sherman, the standard tank of the IDF armored units in the early 1950s.
The project started in 1954, and in 1955 a prototype turret was sent from France to Israel. In March 1956 Israeli Ordnance Corps facilities started to convert tanks, using guns received from France. The gun was known in Israel as the M-50 and as a result the upgunned Sherman was designated Sherman M-50. The M-50 was similar to the Sherman Firefly in that it had the original turret of the "old" type (as used by the 75 mm gun M3 armed Shermans), which was fitted with a large counterweight at the rear end.
The first 50 units were based on M4A4 hulls, had a Continental R-975 gasoline engine and VVSS suspension. However, the increased weight of the vehicle combined with narrow tracks led to poor off-road mobility. It was also putting too much strain on the engine, resulting in frequent mechanical failures. Consequently, for the rest of the conversions, hulls fitted with HVSS suspension and Cummins V-8 460 horsepower (340 kW) diesel engine were adopted. These subvariants were sometimes referred to as the M-50 Continental and M-50 Cummins. Diesel engines were also preferred since diesel fuel is less flammable than gasoline, which factors into battlefield survivability. In total, about 300 M-50s were built by 1964 (though it's possible that this number includes 120 155 mm self-propelled guns on Sherman chassis, also designated M-50).
In the 1960s, 180 Sherman tanks received the even more powerful French 105 mm Modèle F1 gun. The barrel length of the gun was reduced from 56 caliber to 44 and equipped with a muzzle brake; ammunition was altered to use a smaller cartridge. In Israel the gun was designated M-51 and the tank the Sherman M-51. M4A1 hulls and "new" turrets (from 76 mm armed Shermans) were used for the conversion. All tanks were fitted with Cummins diesel engines and HVSS suspension. The tank was displayed to the public for the first time during the Independence Day ceremony in 1965.
Abroad the M-50 was known as Super Sherman (the "Continental" variant as Mark I and the "Cummins" variant as Mark II) and the M-51 as either Super Sherman or Isherman (i.e. Israeli Sherman). These designations were never used in Israel. The only tank model designated Super Sherman by the IDF was M4A1 with 76 mm M1 gun and HVSS suspension, which was named Super Sherman M-1.
The first 25 M-50s were finished just in time for Operation Kadesh - the Israeli 29 October 1956 invasion of the Sinai - against the Egyptian Army (which also employed its own up-gunned version of the M-4 Sherman, fitted with the French AMX-13 turret, making it equal to the M-50 in firepower).
In 1964, Israel started to divert water from the Sea of Galilee to the Negev Desert for agricultural purposes. The Arab nations were in uproar, and Syria began a project to divert water into Jordan (the Headwater Diversion Plan). Maj General Israel Tal had trained Israeli tank gunners to shoot beyond 1,500 metres (1,600 yd) and, on March 6, 1965, an M-50, commanded by Tal, engaged a Syrian recoilless rifle that had killed an Israeli tractor driver; Tal personally destroyed the recoilless rifle at long range. A few days later, General Tal, with an M-50 and a Centurion Mk III tank, was waiting for a chance to fire upon the Syrian water diverting project. When Syrian gunners fired on a border patrol, Tal's M-50 and the Centurion fired on eight tractors 2,000 metres (2,200 yd) away, and destroyed them all in two minutes with 10 shots - Tal destroyed 5 tractors with his M-50's 75 mm gun, and the Centurion destroyed the remainder.
Both the M-50 and M-51 saw combat in the Six-Day War that left the Golan Heights, the West Bank, and the Sinai peninsula in Israeli hands, often fighting against Soviet World War II-era armor like the T-34-85 (for example at the Battle of Abu-Ageila). Both were also employed in the 1973 Yom Kippur War alongside and against much more modern tanks. The use of such seemingly obsolete tanks was necessary given the desperate nature of the fighting.
In combat against the Arab armies, the M-51 proved itself capable of fighting newer, heavier tanks like the Soviet-built T-54/55/T-62. The M-51's 105 mm gun could penetrate these adversaries using HEAT ammunition. The M-51 served well during its time, and is regarded as an excellent example of how an obsolete tank (the Sherman) can be upgraded beyond the limits of its original capabilities.
M-50 Continentals were retired by 1972. The M-50 Cummins and M-51 were gradually phased out in late 1970s to early 1980s. During the Lebanese Civil War, a total of 75 M-50s were given to the Israeli-supported Lebanese Christian militias – Kataeb Regulatory Forces (19), Tigers Militia (20), Guardians of the Cedars (1), the Lebanese Forces (40), and the South Lebanon Army (35) – in 1976; two tanks were later captured by the Palestinian Liberation Organization (PLO), which they employed in the defense of West Beirut during the June 1982 Israeli invasion of Lebanon.
About 100 of the remaining tanks of this model were sold to Chile in late 70's. Some of those were fitted with the Chilean Army's IMI-OTO 60 mm Hyper Velocity Medium Support (HVMS) gun, and were often referred to as M-60. This variant was never used by the IDF. Chile used its Shermans into 1989.
The few M-51s that Israel retained were converted into engineer vehicles and self-propelled artillery.
- Chile – ≈50 M-50 upgraded with the 60 mm IMI-OTO HVMS gun, ≈150 M 51
- Israel – M-50, M-51
- Lebanon – M-50 (Kataeb Regulatory Forces, Lebanese Forces, Tigers Militia, Guardians of the Cedars, South Lebanese Army)
- Palestine – M-50 (Palestine Liberation Organization)
- Givati, p. 82-85.
- Givati, pp. 83-84.
- Granovskiy, Names, Designations and Service Figures of IDF Armored Vehicles.
- Givati, p. 105-108
- Givati, p.45
- Givati, p.106
- Givati, pp. 109-110, p.123.
- George Forty, Tank Action, pp. 249-250, ISBN 0-7509-0479-8
- Gelbart, p.45
- http://milinme.wordpress.com/category/sherman/ - Photos of two derelict M-50 Shermans at the Beirut Stadium being inspected by French MNF paratroopers, September 1982.
- Gelbart, Marsh (1996). Tanks: Main battle and light tanks. London: Brassey's. ISBN 1-85753-168-X.
- Givati, Moshe - The Armor Craftsmen - The History of the 7100 Restoration and Maintenance Center, MoD 1998 ( ISBN 965-05-0902-X, 1998, משה גבעתי - בידיהם חושלה הפלדה - סיפורו של מרכז שיקום ואחזקה 7100, משרד הבטחון הוצאה לאור ).
- Moustafa El-Assad, Blue Steel IV: M-50 Shermans and M-50 APCs in South Lebanon, Blue Steel books, Sidon 2007.
- Oleg Granovskiy, Names, Designations and Service Figures of IDF Armored Vehicles (Олег Грановский - Названия, обозначения и количества бронетанковой техники АОИ) at Waronline.org (Russian)