IDF Mansouri Operation 2026: Before and After Brigade-Level Security Zone Operations
IDF destroyed over 600 Hezbollah sites in Mansouri using 55th Brigade and Yahalom Unit in September 2026 security zone operation.
The israel Defense Forces completed a brigade-level operation in Mansouri, southern Lebanon, on September 28, 2026, destroying over 600 Hezbollah infrastructure sites and eight underground tunnels. The 55th Reserve Paratroopers Brigade, operating under the 91st Division with the elite Yahalom combat engineering unit, carried out the mission over several weeks. The operation aimed to prevent Hezbollah from reestablishing itself in the security zone.
How Israeli Security Operations Changed After the 2024 Ceasefire Collapse
On November 27, 2024, Israel and Lebanon signed a ceasefire agreement mediated by the United States and France. Under the ceasefire, Israeli forces were to withdraw by January 26, 2025, then by February 18, 2025, but Israel maintained five military outposts on highlands in southern Lebanon. Hezbollah launched strikes on Israel on March 2, 2026, after the US and Israel attacked Iran and assassinated its supreme leader; Israel resumed airstrikes and began ground operations on March 16, 2026.
The IDF stated on March 16 that troops had begun a 'targeted ground operation' against 'key objectives' in southern Lebanon as part of Israel's efforts to expand the buffer zone following Hezbollah rocket attacks, describing it as an effort to establish forward defense and create an additional layer of security for residents of the north. The shift from limited ceasefire monitoring to full brigade-level operations marks a fundamental change in how Israel approaches the Lebanese border.
Before 2026: Limited Cross-Border Operations and Ceasefire Monitoring
Before the March 2026 escalation, Israeli military activity in southern Lebanon consisted primarily of defensive postures and limited strikes. After the November 27, 2024 ceasefire, most IDF operations consisted of detonation of seized Hezbollah weaponry and demolition of ostensibly civilian infrastructure in Lebanese locales near the Blue Line. The military believed several Hezbollah cells remained trapped in IDF-held territory since the ceasefire took effect, and the ceasefire came into effect exactly when troops were at the lines they wanted to reach.
Many readers ask whether the 2024 ceasefire was ever implemented—the short answer is partially, because Israel maintained positions but did not withdraw fully, while Lebanon's efforts to disarm Hezbollah were incomplete. The Lebanese Armed Forces successfully cleared numerous Hezbollah tunnels, rocket-launching sites, and fortified positions south of the Litani River, removing approximately 10,000 rockets, 400 missiles, and 205,000 unexploded ordnance fragments.
After March 2026: Brigade-Level Operations and Security Zone Expansion
The IDF cut its forces in southern Lebanon from eight brigades down to six in late September 2026, pulling four brigades out and replacing them with only two. The four brigades that exited Lebanon were the Commando Brigade, the Golani Brigade, and two reservist brigades: the 55th Paratrooper Reservist Brigade and the 4th Armored Reservist Brigade; in their stead, the 188th Armored Brigade and Ground Forces Training School Brigade entered. The reduction reflects a shift toward sustained occupation rather than active combat.
Mansouri, about 6 miles south of Tyre and roughly 6 miles north of the Israeli border, sits inside the security zone; residents were ordered to leave nearly two months ago. Mansouri, the northernmost point of the Israeli-occupied zone along the coast, has faced methodical Israeli destruction for several months, including daily demolitions, artillery fire, and airstrikes. This systematic approach differs sharply from the quick-strike operations of 2024.
Operational Scale: 600 Sites vs. Previous Limited Strikes
During the Mansouri operation, troops dismantled more than 600 terrorist infrastructure sites and, in cooperation with the Yahalom Unit, eight underground routes were dismantled; IDF soldiers also located dozens of missile launchers that had been left in the Security Zone prior to the ceasefire agreement taking effect. This scale represents a dramatic increase from 2024-2025 operations.
| Period | Operation Type | Force Size | Sites Destroyed | Primary Goal |
|---|---|---|---|---|
| Nov 2024–Feb 2025 | Ceasefire monitoring | 5 outposts | Limited demolitions | Prevent Hezbollah resupply |
| March–June 2026 | Expanded ground invasion | 8 brigades | Hundreds per operation | Establish buffer zone to Litani River |
| July–Sept 2026 | Sustained occupation | 6 brigades | 600+ in Mansouri alone | Prevent Hezbollah reestablishment |
| Comparison metric | Brigade-level vs. outpost | 6,000+ troops vs. ~500 | 10x increase | From monitoring to occupation |
Infrastructure Targeting: Tunnels, Command Centers, and Civilian Structures
Israeli officials said the operation consolidated its security zone, and a network extended for more than 2 km containing dozens of rockets, missiles and drones, as well as anti-tank missiles, mines and explosive devices. The military said a central command complex belonging to Hezbollah's Badr unit was located within the underground infrastructure, containing command centres, weapons storage rooms and living quarters that allowed fighters to remain underground for extended periods.
Before March 2026, Israeli operations rarely engaged with large-scale underground infrastructure. The Israeli military destroyed underground infrastructure used by Lebanese militant group Hezbollah in a village in southern Lebanon on June 28, 2026, targeting a 200-meter-long tunnel in Majdal Zoun with US notification ahead of the attack. These operations became routine by mid-2026, whereas they were exceptional events in 2024-2025.
Regional Impact: Lebanese Displacement and Political Response
Israel undertook sustained ground operations in some areas of southern Lebanon, carrying out demolitions and maintaining a presence in several areas near the Blue Line where Israeli authorities stated the IDF would establish a 'buffer zone'; heavy fighting between the IDF and Hezbollah has been reported in several areas south of the Litani, including in Bint Jbeil and Khiam. More than a million Lebanese have been driven from their homes by the conflict that has run in parallel with the wider Iran war.
Many families considering aliyah from Lebanon or with relatives in northern Israel ask about the permanence of the security zone—the reality is that Israeli officials have signaled a long-term presence. Israeli Defense Minister Israel Katz stated the IDF would establish a security zone in Southern Lebanon extending to the Litani River, and at the conclusion of the operation, the IDF will position themselves in a security zone inside Lebanon along a defensive line against anti-tank missiles. The Litani River lies some 20 miles north of the Blue Line.
What This Means for Northern Israeli Communities in 2026
Israeli Prime Minister Benjamin Netanyahu announced Israel's goal of returning 60,000 Israeli citizens to their homes in northern Israel who have been displaced for nearly a year as a consequence of Hezbollah rocket attacks. As we covered in our analysis of Israel Hezbollah conflict security realities, the brigade-level operations represent an attempt to create conditions for return.
The Northern Command is conducting a determined operation against Hezbollah, during which more than 400 terrorists have been eliminated so far, including senior members of the organization. For families considering aliyah to northern communities or current residents weighing return, the operational shift from 2024's limited strikes to 2026's sustained brigade presence represents the most significant change in Israel's Lebanon posture since the 2000 withdrawal.
The Mansouri operation exemplifies how Israeli military doctrine evolved from reactive ceasefire enforcement in late 2024 to proactive infrastructure destruction across a 20-mile-deep security zone by September 2026. Whether this approach proves sustainable depends on Lebanon's willingness to deploy the Lebanese Armed Forces and Hezbollah's capacity to rebuild—both questions that remain unresolved as of late 2026.
Frequently Asked Questions
How many IDF troops are currently operating in southern Lebanon?
As of September 2026, the IDF maintains six brigades in southern Lebanon, down from eight brigades earlier in the year. Each brigade typically includes 3,000-5,000 personnel, meaning approximately 18,000-30,000 troops are deployed in the security zone at any given time, with additional rotations for reservist units like the 55th Paratroopers.
What was destroyed in the Mansouri operation specifically?
The IDF destroyed over 600 infrastructure sites, eight underground tunnel networks, dozens of rocket launchers, weapons storage facilities, command centers, and living quarters designed for extended underground operations. The Yahalom combat engineering unit handled the specialized demolition work over several weeks in September 2026.
Can Lebanese residents return to Mansouri and other border villages?
No. Residents of Mansouri were ordered to evacuate nearly two months before the September 2026 operation, and Israeli authorities have not announced any timeline for civilian return. The systematic demolition of structures and ongoing security operations make return impossible in the near term, affecting tens of thousands across the security zone.
How does the 2026 security zone differ from Israel's previous Lebanon occupation?
Israel maintained a security zone in southern Lebanon from 1985 to 2000, primarily through the South Lebanon Army proxy force. The 2026 zone extends farther north (potentially to the Litani River, 20 miles from the border), uses direct IDF brigade control rather than proxies, and focuses on infrastructure destruction rather than permanent bases, though the ultimate scope remains unclear as operations continue.
Further reading: Hebrew Level for Aliyah Work: What Changed Since 2020 — AliyaToday.
Further reading: Israel's ₪5 Billion Power Plant Expansion: What It Means for Your Aliyah Electricity Costs — AliyaToday.
Further reading: French Aliyah Hits 5,000 by Late 2026: Government Incentives, Not Panic, Drive the Surge — AliyaToday.
Further reading: Beer Sheva Aliyah 2026: The Nine-Month Timeline Nobody Mentions — AliyaToday.
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