An Israeli invasion of Gaza will face an enemy that has built a formidable armoury with Iran's help, dug a vast tunnel network to evade attackers and has shown in past ground wars it can exact a heavier toll on Israeli troops each time. As Israel masses tanks on Gaza's border and suggests that the start of an invasion is only a matter of time, Israel's generals will look to lessons learned from ground offensives in 2008 and 2014 that also aimed to smash the Palestinian Islamist group Hamas, an Israeli security source and experts said.
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