14 September USA Today - Israeli Military Studies Hezbollah's Resilience by Yaakov Katz.

Israel's military has ordered a series of investigations to examine why its armed forces were unable to crush Hezbollah militants during a month of fighting in Lebanon.

Hezbollah guerrillas proved a resilient foe for Israel's vaunted military, inflicting casualties and firing missiles into Israel despite a punishing air campaign. Even after Israel sent thousands of troops into Lebanon, Israeli military commanders were still surprised by Hezbollah's capabilities.

“This is by far the greatest guerrilla group in the world,” said Brig. Gen. Guy Zur, commander of Division 162. His division lost 12 soldiers during an effort by Israel to gain ground days before a United Nations-brokered cease-fire went into effect Aug. 14...

Israel withdrew from Lebanon in 2000 after an 18-year occupation in the south. Hezbollah used the past six years to build a complex network of tunnels and other fortifications in southern Lebanon. Some of these bunkers were found a couple hundred yards from the border with Israel.

Israeli troops, Saguy said, walked into traps Hezbollah had been preparing for six years.

Hezbollah is rearming after Israel lifted the sea and air blockade of Lebanon, allowing the group to get smuggled weapons, some experts say.

“Hezbollah is working to recover its arsenal and will be in several months where it was before the war,” Ganor said.