How they gloried in their early victories! The Palestinians were massacred, they were nothing. The Israeli military machine, the most powerful army in the world, with unlimited US funding, had no difficulty in 'pacifiying' south Lebanon. Their occupation of the crusader fortress, Beaufort Castle, was a symbol of the power of their crusade.
The only, slight, problem was some resistance from the Shia population of the south, and both the Christian militias and the IDF used to make quite funny jokes about how easily they would crush these ignorant villagers. And they did, again and again. But they kept having to come back and do it again. And the pacification campaign dragged on, the weeks into months, the months into years. Then, in the 1990s, after 10 years of occupation something slipped, and the Israelis found themselves in a nightmare of endless low-intensity warfare. The Shia militias had got better, and also, the Israelis were plagued with bad luck. Equipment failures, security breaches, it went on and on.
The Israelis were driven out of Lebanon, fleeing in the end before the Hezbollah. They tried to blow up Beaufort Castle, before they left, but the walls still stood. A monument to folly.
It is not good to proclaim that God is on your side, unless you are positively sure of the outcome. A similar fate overtook a Muslim power (Indonesia) when they thought they could easily dominate the Christian population of East Timor, but more on that another time. God favors whom He will favor.