Israel Expands Military Operations in Southern Lebanon: Combat Zone Declared, Ground Forces Push Beyond Buffer Zone

The developments effectively dismantled the ceasefire framework, which had already been strained by daily violations . While the truce officially remained in effect, the scale of operations made clear that a return to full-scale war was a real and imminent risk.

A 2,000 sq km Zone of Conflict

The combat zone declaration was Israel’s largest such order since the April 17 ceasefire began . By designating all areas south of the Zahrani River—approximately 40 kilometers (25 miles) from the Israeli border—as active combat zones, the IDF signaled a major geographic expansion of its operations .

An Israeli military spokesperson posted on X: "We advise residents of southern Lebanon to evacuate to the north of the Zahrani River, as all areas south of the river are considered a combat zone." The post warned the military would act "with great force" against Hezbollah in that zone .

The order covered nearly 14% of Lebanese territory and came as strikes continued into a second day across southern and eastern Lebanon, including the Beqaa Valley and the city of Tyre .

Heaviest Bombardment Since the Ceasefire

On Tuesday, May 26, Israeli forces launched what Lebanese security sources described as one of the heaviest days of bombing in weeks—over 120 airstrikes targeting southern and eastern Lebanon .

Lebanon's Health Ministry confirmed at least 31 people killed and 40 wounded in the Tuesday strikes . Among the dead were 14 civilians in the town of Burj al-Shamali in the Tyre district, including two children and three women . Shelling also struck near the medieval Beaufort Castle and the Qana area .

Strikes continued into Wednesday, May 27, as Lebanese families observed Eid al-Adha. Lebanese authorities reported at least nine additional people killed that day . The IDF said it hit more than 100 Hezbollah infrastructure sites and fighters . The escalation followed Prime Minister Benjamin Netanyahu's public vow to step up military action against Hezbollah .

Pushing Past the "Yellow Line"

The airstrikes were accompanied by a deeper ground campaign. Israeli troops expanded operations beyond the so-called "Yellow Line" — a unilaterally declared security zone stretching roughly 10 kilometers deep inside Lebanese territory that was established after the April ceasefire .

Two sources confirmed the IDF had moved past this demarcation line, though the precise extent of the advance was not disclosed . The Yellow Line is separate from the UN-demarcated Blue Line that marks the official border, and forms part of a proposed buffer zone extending 5 to 10 kilometers into southern Lebanon .

The most strategically significant development was the advance toward the Litani River, which has functioned as a de facto boundary throughout the conflict. Israel had previously destroyed its main bridges to cut off southern Lebanon . On May 27, Israeli forces and Hezbollah fighters clashed in the area of Zawtar al-Sharqiyah, a town north of the Litani, Hezbollah confirmed .

Netanyahu said the military was "deepening" its operations and "seizing strategic areas" . An Israeli military official described the operations as "targeted" moves to "remove direct threats" beyond the Forward Defense Line .

The push beyond the Litani echoed earlier stated ambitions: in March, Israeli Defense Minister Israel Katz said the military would maintain a "security zone" up to the Litani River indefinitely and ban displaced residents from returning .

Hezbollah's Defensive Counterattacks

Hezbollah claimed its fighters engaged Israeli troops north of the Litani River on May 27 . The group said it used explosive drones, rockets, and artillery in what it described as defensive military operations against Israeli advances .

These operations were part of a broader pattern of daily counterattacks throughout May. Hezbollah reported carrying out:

• 24 operations on a single 24-hour period in mid-May, targeting troop gatherings, Merkava tanks, D9 bulldozers, and command centers in towns like Khiam, Deir Seryan, and Naqoura
• 19 operations on May 17, including drone and artillery strikes against Israeli positions
• 14 operations using explosive drones, rockets, and artillery shells against Israeli forces across multiple border towns on May 19

According to the Alma Research Center, Hezbollah carried out 161 attack waves against Israel and IDF forces in southern Lebanon during a single week in late May (May 17–24), with most attacks against Israeli territory using explosive drones . The fiber-optic-guided drones used by Hezbollah have proven particularly difficult to detect and intercept .

Civilian Cost and Displacement

The intensified operations occurred during the Eid al-Adha holiday, compounding the humanitarian impact. Israeli strikes hit Tyre and surrounding areas while families were observing the holiday .

The combat zone declaration covering 2,000 square kilometers forced additional mass evacuations on top of an existing displacement crisis . Earlier evacuation orders had already emptied dozens of towns and villages south of the Litani River .

Lebanon's Health Ministry reported that Israeli attacks across the country have killed more than 3,100 people and injured thousands more since renewed hostilities began in early March 2026 . The conflict resumed on March 2, 2026, after Hezbollah fired rockets into northern Israel following months of ceasefire violations .

A Ceasefire in Name Only

The escalation underscored the near-total collapse of the April 16 ceasefire. That truce, meant to halt fighting following a massive April 8 Israeli operation that killed at least 357 people in a single day, had been violated almost daily by Israeli air and artillery strikes, according to Lebanese officials and security sources .

Israeli officials insisted the military was responding to Hezbollah violations and acting to protect northern Israeli communities. "We are reinforcing and expanding our control of the area to protect the returning residents of the Galilee and communities in the north," said an Israeli military spokesperson .

The late May escalation came days ahead of scheduled talks in Washington between Lebanese and Israeli delegations . It also unfolded against a broader regional context of ongoing Israeli operations across Gaza and Syria, and U.S.-Iran diplomatic contacts, though the immediate focus remained squarely on southern Lebanon.