The organisation, which on Friday announced the death in Syria of its military commander, has sent thousands of combattants -- between 5,000 and 8,000 according to experts -- since 2013 to help the regime against rebels and jihadists.
Syria is a majority Sunni Muslim country, but the regime is in the hands of President Bashar al-Assad's Alawite clan, an offshoot of Shiite Islam.
- Solidarity and logistical support -
- April 18, 2011: Hezbollah expresses firm support for Assad's regime, just over a month after the start of unprecedented anti-regime protests in Syria.
- December 6: Hezbollah leader Hassan Nasrallah vows to stand by Assad to the end, lashing out at Syria's opposition for allegedly serving US and Israeli interests.
- August 10, 2012: The US Treasury Department denounces Hezbollah -- linked to Iran and listed by Washington as a terrorist group -- for backing Assad and adds it to a list of organisations under sanctions for their ties to the Syrian regime, pointing to its "integral role" in the violence.
- Battle for Qusayr -
- April 30, 2013: Hezbollah fighters are aiding troops in Syria to combat the revolt, Nasrallah reveals, adding that Hezbollah and Iran could intervene on the ground.
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- June 5: the Syrian army recaptures the key town of Qusayr, in a mountainous rebel stronghold along the Lebanese border, following an assault led by Hezbollah.
- Attacks on Hezbollah strongholds -
- August 15, 2013: A powerful car bomb kills at least 27 people in a Beirut Hezbollah stronghold. A day later, Nasrallah says he is ready to fight in Syria and accuses Sunni Islamist radicals for the bombing.
- November 19, 2013 : A double suicide attack claimed by an Al-Qaeda-linked group targets the Iranian embassy in Beirut, killing 25 people.
- February 19, 2014: Two suicide car bombs target an Iranian cultural centre in Beirut, killing 11 people. It was the ninth attack in a Hezbollah stronghold since July 2013.
- November 12, 2015: Twin blasts claimed by the jihadist Islamic State group kill at least 44 people on a busy shopping street in southern Beirut, a Hezbollah stronghold.
- In Syria, the Sayeda Zeinab mausoleum, where Hezbollah says it is fighting "takfiris" (Sunni Muslim extremists who consider Shiites heretics), has been attacked on several occasions by jihadists, including a triple explosion in January 2016 in which at least 70 were killed and a double suicide attack in February that killed 134.
- Military chief killed -
- March 21, 2016: Nasrallah vows Hezbollah will keep fighting in Syria alongside Assad's forces until the Islamic State and Al-Qaeda jihadists are defeated, speaking a week after a key Assad backer, Russia's President Vladimir Putin, announced the partial withdrawal of Moscow's forces.
- May 13: Hezbollah announces the death of its military commander in Syria, Mustafa Badreddine, in a blast near Damascus airport, saying it was still investigating the attack.