Israeli–Lebanese conflict

The Israeli–Lebanese conflict, or the South Lebanon conflict, is a long-running conflict involving Israel, Lebanon-based paramilitary groups, and sometimes Syria. The conflict peaked during the Lebanese Civil War. In response to Palestinian attacks from Lebanon, Israel invaded the country in 1978 and again in 1982. After this it occupied southern Lebanon until 2000, while fighting a guerrilla conflict against Shia paramilitaries. After Israel's withdrawal, Hezbollah attacks sparked the 2006 Lebanon War. A new period of conflict began in 2023, leading to the 2024 Israeli invasion of Lebanon.

The Palestine Liberation Organization (PLO) recruited militants in Lebanon from among the Palestinian refugees who had been expelled or fled after the creation of Israel in 1948. After the PLO leadership and its Fatah brigade were expelled from Jordan in 1970–71 for fomenting a revolt against the king, they entered southern Lebanon, resulting in an increase of internal and cross-border violence. Meanwhile, demographic tensions over the Lebanese National Pact led to the Lebanese Civil War (1975–1990). PLO actions were one of the key factors in the eruption of the Lebanese Civil War and its bitter battles with Lebanese factions caused foreign intervention. Israel's 1978 invasion of Lebanon pushed the PLO north of the Litani River, but the PLO continued their campaign against Israel. This invasion led to the deployment of United Nations peacekeepers in southern Lebanon. Israel invaded Lebanon again in 1982 and, in alliance with the Christian Lebanese Forces, forcibly expelled the PLO. In 1983, Israel and Lebanon signed the May 17 Agreement providing a framework for the establishment of normal bilateral relations between the two countries, but relations were disrupted with takeover of Shia and Druze militias in early 1984. Israel withdrew from most of Lebanon in 1985, but kept control of a 19-kilometre (12-mile) security buffer zone, held with the aid of proxy militants in the South Lebanon Army (SLA).

In 1985, Hezbollah, a Lebanese Shia Islamist movement sponsored by Iran, called for armed struggle to end the Israeli occupation of Lebanese territory. It fought a guerrilla war against the IDF and SLA in south Lebanon. Israel launched two major operations in southern Lebanon during the 1990s: Operation Accountability in 1993 and Operation Grapes of Wrath in 1996. Fighting with Hezbollah weakened Israeli resolve and led to a collapse of the SLA and an Israeli withdrawal in 2000 to their side of the UN designated border.

Citing Israeli control of the Shebaa farms, Hezbollah continued cross-border attacks intermittently over the next six years. Hezbollah now sought the release of Lebanese citizens in Israeli prisons and successfully used the tactic of capturing Israeli soldiers as leverage for a prisoner exchange in 2004. The capturing of two Israeli soldiers by Hezbollah ignited the 2006 Lebanon War, which saw cross-border attacks and another Israeli invasion of the south. Its ceasefire called for the disarmament of Hezbollah and the respecting of the territorial integrity and sovereignty of Lebanon by Israel. Hostilities were suspended on 8 September.

After the 2006 war the situation became relatively calm, despite both sides violating the ceasefire agreements; Israel by making near-daily flights over Lebanese territory, and Hezbollah by not disarming. There was an increase in violence during the April 2023 Israel–Lebanon shellings.

The Gaza war sparked a renewed Israel–Hezbollah conflict, beginning one day after the October 7 Hamas-led attack on Israel. The conflict initially consisted of tit-for-tat airstrikes and shelling. The conflict escalated in September 2024, beginning with the Israeli explosion of Lebanese pagers and walkie talkies. Israel then began an aerial bombing campaign throughout Lebanon, killing at least 569 people on 23 September; the largest conflict-related loss of life in a single day in Lebanon since the Civil War.