The Israeli assault on Hamas in Gaza is going to be a replay, we�re told, of the attempt to subdue Hezbollah in southern Lebanon in the summer of 2006. And the outcome, it�s asserted, will be the same: lots of death and destruction, no strategic victory for Israel and a setback for all who seek peace and progress in the Middle East.

William Kristol

Obviously, war is an unpredictable business, so I say this with some trepidation: I think the conventional wisdom will be proved wrong. Israel could well succeed in Gaza.

For one thing, southern Lebanon is a substantial and hilly area, bordered by northern Lebanon and Syria, through which Hezbollah could be re-supplied, both by Syria itself and by Iran. Gaza is a flat, narrow strip, bordered by Israel, as well as by the sea and by Egypt, no friend to Hamas. By cutting off the northern part of Gaza from the southern, Israel has basically surrounded northern Gaza, creating a military situation very different from that in Lebanon in 2006.

What�s more, the Israeli leadership seems aware of the mistakes � political, strategic and military � it made in Lebanon. That doesn�t mean it won�t make them all over again. The same prime minister, Ehud Olmert, is in charge, after all. But, today�s defense minister, Ehud Barak, is very different from his predecessor, the weak and unqualified Amir Peretz. So far as one can tell, the Gaza operation seems to have been well-planned and is being methodically executed, in sharp contrast to the Lebanon incursion. Barak has also warned that the operation could be long and difficult, lowering expectations by contrast with the Israeli rhetoric of July 2006.

In addition, in Lebanon, Israel proclaimed war goals that it couldn�t achieve � such as retrieving its two kidnapped soldiers and disarming Hezbollah. Now the Israeli government says that it seeks to weaken Hamas, lessen its ability to fire rockets from Gaza and secure new arrangements along the Egyptian-Gaza border to prevent Hamas from re-arming. These may well be achievable goals.

And, of course, not all military efforts against terror fail. Recall Israel�s incursion into the West Bank in the spring of 2002, when, under the leadership of Ariel Sharon, Israel succeeded in ripping up established terror networks and began the defeat of the second intifada. Israel also was able to avoid a long-term re-occupation, while retaining the ability to go back in on anti-terror missions. What�s more, the 2002 bloodshed didn�t seem to do lasting damage to hopes for progress or moderation on the West Bank. After all, it�s Gaza, from which Israel withdrew in 2005, not the West Bank, that became a Hamas stronghold.

An Israeli success in Gaza would be a victory in the war on terror � and in the broader struggle for the future of the Middle East. Hamas is only one manifestation of the rise, over the past few decades, of a terror-friendly and almost death-cult-like form of Islamic extremism. The combination of such terror movements with a terror-sponsoring and nuclear-weapons-seeking Iranian state (aided by its sidekick Syria) has produced a new kind of threat to Israel.

But not just to Israel. To everyone in the Middle East � very much including Muslims � who aren�t interested in living under the sway of extremist regimes. And to any nation, like the United States, that is a target of Islamic terror. So there are sound reasons why the United States � whether led by George W. Bush or Barack Obama � will stand with Israel as it fights.

But Israel � assuming it succeeds � is doing the United States a favor by taking on Hamas now.

The huge challenge for the Obama administration is going to be Iran. If Israel had yielded to Hamas and refrained from using force to stop terror attacks, it would have been a victory for Iran. If Israel were now to withdraw under pressure without accomplishing the objectives of severely weakening Hamas and preventing the reconstitution of a terror-exporting state in Gaza, it would be a triumph for Iran. In either case, the Iranian regime would be emboldened, and less susceptible to the pressure from the Obama administration to stop its nuclear program.