Here's What You Need To Remember: In a way, the two sides of the 1973 acted as stand-ins for their patrons; Egypt, which imported modern Soviet weaponry, and Israel, which both imported and manufactured its own versions of cutting-edge Western equipment.

During the Cold War, the armies of NATO and the Warsaw Pact stood poised to wage devastating, large-scale mechanized warfare using a bewildering arsenal of modern weapons including main battle tanks, infantry fighting vehicles, helicopter gunships, jet fighters, short-range ballistic missile launchers, supersonic bombers, surface-to-air missile systems, and tactical nuclear artillery.

Yet fortunately for humanity, that conflict never took place. Despite numerous bloody proxy and civil wars, there were few interstate clashes between large mechanized armies. The handful of exceptions notably include the 1965 and 1971 Indo-Pakistani conflicts and the Iran-Iraq war. However, the most intense mechanized battles since World War II took place in October 1973 when Egypt and Syria launched a surprise assault on the Israeli border fortifications during the Jewish Yom Kippur holiday.

The Arab and Israeli armies were lavishly equipped with then state-of-the-art tank, jets, and missiles from the Soviet Union and West respectively, including new types of weapons that would see their first major combat test. The result was a hi-tech slugging match of unprecedented scale and tempo.

The war was conceived by Egyptian President Anwar Sadat and Syrian leader Hafez al-Assad to recapture the Golan Heights and Sinai, which had been seized by Israeli forces in the humiliating Six Day War. The wide-open deserts of the Middle East heavily favored armor and air power, and the IDF's tank and fighter units had significantly outperformed their adversaries.

Syria and Egypt sought to improve their officer corps and imported large quantities of modern Soviet weapons, as well as advisors to instruct in their use—though, by 1973, Egypt was already courting Washington's favor at the expense of Moscow's. Sadat also waged a ‘War of Attrition' attempting to wear down IDF border positions with shelling and air attacks. However, the Israelis dealt back more punishment than they received, and Sadat acceded to a ceasefire on August 1970.

Israel’s defensive strategy during the Six Day War was based on launching a preemptive strike before an Arab attack. By early October 1973, Tel Aviv was aware of Arab preparations for war—including a warning delivered secretly in person by King Hussein of Jordan! But U.S. Secretary of State Henry Kissinger warned Israel not to initiate hostilities, or risk losing U.S. support. At an 8 AM meeting on October 6, Israeli Prime Minister Golda Meir considered launching a preemptive strike—and decided against.

Six hours later, over 2,000 Egyptian howitzers, siege mortars, and rocket launchers unleashed a titanic barrage on the Israeli fortifications of the Bar Lev Line on the east bank of the Suez Canal. Overhead, 200 MiG and Sukhoi jets roared over the frontline to plaster Israeli airbases, artillery batteries and command posts.

Recommended: What Will the Sixth-Generation Jet Fighter Look Like?

Recommended: Imagine a U.S. Air Force That Never Built the B-52 Bomber

Recommended: Russia's Next Big Military Sale - To Mexico?

Recommended: Would China Really Invade Taiwan?

Meanwhile, the first 4,000 Egyptian infantrymen crossed the canal using inflatable boats in a meticulously planned assault codenamed Operation Badr. The Egyptians also deployed amphibious PT-76 tanks and BTR-50 personnel carriers to ford the Greater Bitter Lake unopposed, and dispatched Mi-8 helicopters on suicidal missions inserting Sa'iqa commandos behind Israeli lines to slow down counterattacks.

Egyptian troops used flamethrowers and rocket-propelled grenades to clear out several of the concrete Israeli outposts, and by 6 PM had secured a two-mile-deep bridgehead. Once the crossing was secured, engineers began erecting pontoon bridges to allow tanks and the first of over 200,000 Egyptian troops. Special pumps were rafted over and used to blast paths through huge obstructing sand embankments built by Israeli engineers.

IDF armored units deployed in reserve rolled forth to counterattack. IDF tanks expected the Arab infantry to be vulnerable, with their heavy weapons still on the western bank, and charged into the fray without artillery or infantry support.

However, Egyptian troops had crossed with an extra-large supply of portable Malyutka (AT-3 Sagger) wire-guided anti-tank missiles. While an RPG remains accurate only up to one to two hundred meters, the Soviet-supplied Malyutka were effective up to two miles away. The AT-3 teams planted their portable launch units on the ground, then took cover nearby and remotely fired the projectile towards the approaching tanks. The missiles remained connected by a huge spool of wire to the launcher, and their operators used a joystick interface to guide the weapons on target manually.

As the Israeli Patton tanks barreled onwards, Malyutkas began sailing towards them at a fast 380 feet per second, their shaped charge warheads easily blasting through armor despite their low velocity. Over 100 Israeli tanks were lost on the first day alone. Two days later, Egyptian signals intelligence intercepted plans for a counterattack by the 162nd Armored Divisions. General Hassan Abu Sa’ada orchestrated an ambush that knocked out 75 tanks in a matter of hours.

Surely, the formidable Israeli Air Force could fly into the rescue? Fly in it did—only to encounter a barrage of surface-to-air missiles. Before the war, Egyptians had relentlessly construed a long string of air defense radars and potent S-125 and mobile 2K12 (SA-6) surface-to-air missiles on the western bank of the canal. Though Israeli forces had hammered the batteries during the War of Attrition, the Egyptians finally completed a deadly integrated air defense system following the ceasefire.

As Israeli F-4 Phantoms and A-4 Skyhawks winged towards the frontline, SA-6 missiles began plucking them from the sky—leading to the loss of 34 Skyhawks in the first four days of the war. Initial attempts to take the SAMs out backfired disastrously, with six Phantoms lost in one failed strike.

However, Israeli fighters did trounce opposing MiGs and Sukhois in air-to-air combat, eventually shooting down two to three hundred opposing fighters for around five losses. At sea, the Israeli missile boats sank nineteen Arab surface combatants—and, accidentally, a Soviet merchant ship—without loss, dodging 52 anti-ship missiles fired in response.

Last Stand on the Golan Heights   

At the same hour as the Egyptian assault, no less than 800 Syrian tanks supported by 188 artillery batteries and 28,000 troops stormed towards the Israeli fortifications on the Golan Heights. The IDF had only two tank units facing them, the 188th Barak and 7th Armored Brigades with 180 Centurion tanks between them, supported by a paratrooper brigade and eleven artillery batteries.

The two brigades needed to hold out for two days against these impossible odds before reserve armor and artillery unit could relieve them. The IDF’s Centurion tanks—later joined by M48 Patton, and even M4 Shermans from World War II, upgraded with powerful 105-millimeter L7 guns—were mostly equally matched with the Soviet T-55 and T-62 tanks barreling towards them, benefiting only from a modestly better fire control, and ramp-like earthworks for cover. The Syrians also mustered new BMP-1s, highly mobile troop transports sporting tank-busting Malyutka missiles and short-range 73-millimeter guns.

However, IDF tankers were vastly better trained and led, while Syrian forces suffered massive communication and coordination problems. Small numbers of Israeli tanks picked off dozens of Syrian T-55s and T-62s, which struggled to spot the source of incoming fire. On several occasions, fire from a lone Israeli tank caused Syrian commanders to halt promising attacks.

Still, the Syrian numerical advantage ground down the Israeli defenders. While the 7th Brigade successfully held the Quneitra gap to the north, the 188th, defending flatter ground to the south, was virtually wiped out in twenty-four hours, its commanders killed and only five tanks left operational by the end of the fighting. While Syrian armor broke through, commandos deployed by helicopter captured a critical Israeli intelligence outpost 2,000 meters above sea level on Mount Hebron.

Israel’s initial battlefield defeats seemed so severe, that on October 9 Israeli Prime Minister Golda Meir ordered Israeli nuclear strike planes and missiles to go on alert. When the United States found out, it began transferring enormous quantities of conventional weapons to bolster the Israelis, including 72 Phantom and Skyhawk jets, 200 Patton tanks, then state-of-the-art TOW missiles and heavy artillery.

Israel Strikes Back

By October 8th, however, IDF reserves were already pouring into the Golan front and swiftly began driving the Syrian troops back. Desperately, the Syrians unleashed FROG-7 rockets on military and civilian targets in Israel. In retaliation, Israeli Phantom jets blew up the Syrian Army General Staff Headquarters in Damascus—causing Assad to pull back air defense units from the frontline, leaving his troops exposed to Israeli airpower. By the 10th the IDF tanks were rolling towards Damascus. Only the intervention of two Iraqi armored divisions and Jordanian brigades slowed down the IDF’s advance.

Egyptian forces were initially content to sit on the recaptured Sinai—but the Syrian collapse prompted the Egyptian 2nd and 3rd Armies to finally launch an armored thrust beyond the umbrella of their anti-tank teams and fixed air defense missiles on October 14.