Ba'athist Syria launched a military intervention in the Lebanese Civil War in 1976, one year after the breakout of the war, as Syrian Arab Armed Forces began supporting Maronite militias against the Palestine Liberation Organization (PLO) and leftist militias. Syria also raised a proxy militia of its own, the Palestine Liberation Army (PLA). Hafez al-Assad's primary objective was to suppress the rise of PLO and allied pro-Palestinian militias in Lebanon which toed a hardline stance against Israel; the invasion received widespread rebuke in the Arab world.
The involvement was later legalized under the pretext of Arab Deterrent Force of the Arab League. In 1982, Syria battled Israel over control of Lebanon.
Timeline 1976 Syrian intervention
On 22 January 1976, Syrian president Hafez al-Assad brokered a truce between the two sides, while covertly beginning to move Syrian troops into Lebanon under the guise of the Palestine Liberation Army in order to bring the PLO back under Syrian influence and prevent the disintegration of their power in Lebanon. Despite this, the violence continued to escalate. In March 1976, Lebanese President Suleiman Frangieh requested that Syria formally intervene. Days later, Hafez sent a message to the United States asking them not to interfere if he were to send troops into Lebanon.
On 8 May 1976, Elias Sarkis, who was supported by Syria, defeated Frangieh in a presidential election held by the Lebanese Parliament. However, Frangieh refused to step down. On 1 June 1976, 12,000 regular Syrian troops entered Lebanon and began conducting operations against Palestinian and leftist militias. This technically put Syria on the same side as Israel, as Israel had already begun to supply Maronite forces with arms, tanks, and military advisers in May 1976.Charles D. Smith, Palestine and the Arab Israeli Conflict, p. 354. Syria had its own political and territorial interests in Lebanon, which sheltered secretly cells of Sunni Islamists and anti-Ba'athist Muslim Brotherhood.
Since January, the Tel al-Zaatar refugee camp in East Beirut had been under siege by Maronite Christian militias. On 12 August 1976, supported by Syria, Maronite forces managed to overwhelm the Palestinian and leftist militias defending the camp. The Christian militia massacred 1,000–1,500 civilians , which unleashed heavy criticism against Syria from the Arab world.
On 19 October 1976, the Battle of Aishiya took place, when a combined force of PLO and a Communist militia attacked Aishiya, a small and isolated Maronite village. The Artillery Corps of the Israel Defense Forces fired 24 shells (66 kilograms of TNT each) from US-made 175-millimeter field artillery units at the attackers, repelling their first attempt. However, the PLO and Communists returned at night, when low visibility made Israeli artillery far less effective. The Maronite population of the village fled. They returned in 1982.
In October 1976, Syria accepted the proposal of the Arab League summit in Riyadh. This gave Syria a mandate to keep 40,000 troops in Lebanon as the bulk of an Arab Deterrent Force charged with disentangling the combatants and restoring calm. Other Arab nations were also part of the ADF, but they lost interest relatively soon, and Syria was again left in sole control, now with the ADF as a diplomatic shield against international criticism. The Civil War was officially paused at this point, and an uneasy quiet settled over Beirut and most of the rest of Lebanon. In the south, however, the climate began to deteriorate as a consequence of the gradual return of PLO combatants, who had been required to vacate central Lebanon under the terms of the Riyadh Accords.
During 1975–1977, 60,000 people were killed.The World Handbook of Political and Social Indicators, Charles Lewis Taylo
Hundred Days War (1977) The Hundred Days War (Arabic: حرب المئة يوم | Harb Al-Mia'at Yaoum), also known as La Guerre des Cent Jours in French, was a subconflict within the 1977–82 phase of the Lebanese Civil War which occurred at the Lebanese Capital Beirut. It was fought between the allied Christian Lebanese Front militias, under the command of the Kataeb Party's President Bachir Gemayel, and the Syrian troops of the Arab Deterrent Force (ADF).
Battle of Zahleh (1980–1981) The Battle of Zahleh (Arabic: معركة زحلة) took place during the Lebanese Civil War, between December 1980 and June 1981. During the seven-month period, the city of Zahle (Arabic: زحلة) endured a handful of political and military setbacks. The opposing key players were on the one side, the Lebanese Forces or LF (Arabic: القوات اللبنانية) aided by Zahlawi townspeople, and on the other side, the Syrian Armed Forces, then part of the peace-keeping Arab Deterrent Force or ADF (Arabic: قوات الردع العربية), aided by some Palestine Liberation Organization (PLO) factions. Demographically, Zahleh is one of the largest predominantly Christian towns in Lebanon. Adjacent to the town's outskirts, the Bekaa valley (Arabic: وادي البقاع), spanning the length of the Syrian borders. Given Zahleh's close proximity to the Bekaa Valley, the Syrian Armed Forces feared a potential alliance between Israel and the LF in Zahleh. This potential alliance would not only threaten the Syrian military presence in the Bekaa valley, but was regarded as a national security threat from the Syrians' point of view, given the close proximity between Zahleh and the Beirut-Damascus highway. Consequently, as a clamp-down strategy, the Syrian forces controlled the major roads leading in and out of the city and fortified the entire Valley. Around December 1980, tension increased between Zahlawi Lebanese Forces and Syrian-backed Leftist militants. From April to June 1981, throughout the four-month period, a handful of LF members, aided by Zahlawi Local Resistance, confronted the Syrian war machine and defended the city from Syrian intrusion and potential invasion.
1982 Syrian warfare with Israel and its allies
According to Zeev Maoz in Defending the Holy Land: A Critical Analysis of Israel's National Security and Foreign Policy the goals of the war were primarily developed by then Minister of Defense Ariel Sharon and were fourfold: 1) "Destroy the PLO infrastructure in Lebanon, including the PLO headquarters in Beirut." 2) "Drive Syrian forces out of Lebanon." 3) "Install a Christian-dominated government in Lebanon, with Bashir Gemayel as President." 4) "Sign a peace treaty with the Lebanese government that would solidify the informal Israeli-Christian alliance and convert it into a binding agreement."Maoz, p. 181 George Ball testified before the U.S: Senate's Foreign Affairs Committee that Sharon's long-term strategy, as revealed in conversations, was one of "squeezing the Palestinians out of the West Bank . .allowing only enough of them to remain for work."Yevgeny Primakov, Russia and the Arabs: Behind the Scenes in the Middle East from the Cold War to the Present, Basic Books 2009 p.201.
Fighting broke out in Jezzine between the Israelis and Syrian forces holding the town. In the Battle of Jezzine, Israeli forces consisting of two tank battalions supported by a reconnaissance company and engineering platoon took Jezzine in a fierce daylong battle against a Syrian battalion, then repulsed a fierce counterattack by dozens of Syrian commandos during the night in combat that lasted until dawn. Meanwhile, Israeli forces continued to advance along the Syrians' right flank.
In an effort to establish air superiority and greater freedom of action, the Israeli Air Force launched Operation Mole Cricket 19 on 9 June. During the course of the operation, the Israeli Air Force scored a dramatic victory over the Syrians, shooting down 29 Syrian planes and also destroying 17 Syrian anti-aircraft missile batteries, employing electronic warfare methods to confuse and jam the Syrian radars.Gabriel, Richard, A, Operation Peace for Galilee, The Israeli-PLO War in Lebanon, New York: Hill & Wang. 1984, p. 164, 165, The Israelis' only known losses were a single UAV shot down and two fighter jets damaged. Later that night, an Israeli air attack destroyed a Syrian armored brigade moving south from Baalbek, and the IAF attacked and destroyed six more Syrian SAM batteries the following day. The easternmost Israeli force, which had been stationary, resumed its advance forward up the Bekaa Valley.Davis, H. Thomas: 40 Km Into Lebanon: Israel's 1982 Invasion
In the center, Israeli forces were ambushed by the Syrians as they approached Ain Zhalta, and were pinned down by Syrian forces firing from superior positions. The Israelis were bogged down, and an infantry battalion was sent in by helicopter to reinforce them. The town was only captured after a two-day armored and infantry battle. After Ain Zhalta fell, the Israelis advanced to the town of Ain Dara, which overlooked the Beirut-Damascus highway, and captured the heights overlooking the town. Along the road to Ain Dara, the Israelis encountered Syrian tank and commando units, and found themselves bogged down as the Syrians took advantage of the terrain. The Israelis called in air support, and Israeli attack helicopters that took advantage of ravines to fly in low beneath their targets to gain an element of surprise proved particularly effective against Syrian tanks. After a daylong battle, the Israelis had surrounded Ain Dara and were in a position to strike on the highway.
In the east, Israeli forces advanced along four main routes towards Joub Jannine, along both sides of the Qaraoun reservoir. The Syrians resisted fiercely. Syrian infantrymen armed with anti-tank weapons staged ambushes against Israeli tanks, and Syrian Gazelle helicopters armed with HOT missiles proved effective against Israeli armor. However, the Israelis managed to capture the valley floor, and the Syrians retreated. The Israelis captured Rachaiya, advanced through Kfar Quoq, and took the outskirts of Yanta. Joub Jannine also fell to the Israelis. The extent of Israeli advances ensured that Syrian reinforcements were blocked from deploying west of the Qaraoun reservoir. An Israeli armored battalion then probed past Joub Jannine to the town of Sultan Yacoub, and was ambushed by Syrian forces lying in wait. In the Battle of Sultan Yacoub, the Israelis fought fiercely to extricate themselves, and called in reinforcements and artillery fire to cover the withdrawal. After six hours, the Israelis managed to retreat. In addition, another major air battle erupted in which the Israeli Air Force shot down 25 Syrian jets and 4 helicopters.
To the west, as IDF troops mopped up remaining resistance in Tyre and Sidon, the Israeli advance on Beirut continued, and Syrian tank and commando units were then deployed south of Beirut to reinforce the PLO. When the Israelis reached the Beirut suburb of Kafr Sill, they met a joint Syrian-PLO force for the first time, and fought a difficult battle to take it. The IDF temporarily halted its advance in the western sector at Kafr Sill.