Like most wars, NATOs 5-week-old campaign to overthrow Libyas Moammar Kadafi has turned out to be harder than it looked. Its certainly moving toward a stalemate, the chairman of the Joint Chiefs of Staff, Adm. Michael G. Mullen, said with disarming candor Friday. What we have perhaps underestimated is Moammar Kadafis capacity to adapt, observed French Foreign Minister Alain Jupp. The leaders of Britain, France and the United States, who launched the intervention, initially hoped Kadafis regime would collapse quickly toppled either by popular uprisings or, more likely, by dissident generals. But that hasnt happened, at least not yet. Instead, Kadafis army has mounted a coherent counteroffensive against the countrys ragtag rebels, pushing them out of central Libya and advancing into the center of Misurata, the last major rebel-held city in the west. Given that grim situation, the stalemate Mullen forecast would be an improvement. And so, last week, the United States and its allies responded with a modest military escalation on three fronts. The U.S. announced that it was sending missile-equipped Predator drones to help stave off a rebel defeat in Misurata, a step back into a combat role despite President Obamas statements that U.S. forces would let others shoulder the fighting. Britain, France and Italy announced that they were sending military advisors to the rebel capital of Benghazi to help the opposition get organized. And NATO stepped up its aerial bombing of military facilities in Surt and Aziziya, two cities far from the wars front lines, to remind Libyan officers that they wont be safe anywhere in the country until the war ends. To some critics, this looked like mission creep, the problem that arises when a limited humanitarian intervention expands to become a more ambitious war. But thats not quite right. In this war, perhaps uniquely, mission creep happened at the outset, when Obama, British Prime Minister David Cameron and French President Nicolas Sarkozy publicly committed themselves to removing Kadafi from power. Now, NATO is facing a prospect even worse than mission creep: mission failure. To prevent it, NATO has adopted a strategy that won a bad name almost half a century ago in Vietnam: graduated escalation, the attempt to find the enemys breaking point with the minimum necessary force. Last weeks escalation was exquisitely limited. Gates said the Air Force was committing exactly two Predators to Libya, and he promised that it was not a step toward putting American boots on the ground. The Europeans said they were sending exactly 10 advisors each to Benghazi, a total of 30, and that they would not participate in combat operations. The stepped-up bombing was modest enough that it attracted almost no attention at all. The NATO leaders hope is that their still-limited military action can provoke someone in Tripoli to overthrow Kadafi. The regime is brittle, they say; its brother leader is no indomitable giant like Vietnams Ho Chi Minh. Libya watchers in the intelligence community say every week brings new reports of generals and other Kadafi loyalists who are on the verge of defecting. Except most of them havent. And so, in addition to the best-case scenario of a palace coup, U.S. officials now talk increasingly of a longer-term scenario: a war of attrition. In this scenario, Kadafis regime gradually erodes as the army runs out of hardware and the leader runs out of money to pay his soldiers, African mercenaries and other supporters. Over time, officials suggest, the rebels will get better organized, the regime will become less capable and the balance of power will shift. The problem is that economic sanctions are slow to bite; some countries, like Turkey, havent even frozen Kadafis assets yet. And Kadafis army doesnt appear to need sophisticated weapons to fight the rebels. The good news is that the rebels are getting better organized. They have an organization chart now, one official told me last week. Qatar and the United Arab Emirates are sending them money, weapons and ammunition, relieving the Western powers of one burden. But military officers say turning the rebels into a fighting force with even rudimentary skills would take six months or more and far more trainers than the 30 advisors Britain, France and Italy are dispatching. This is likely to take a while, Defense Secretary Robert M. Gates said laconically at his news conference Thursday. If time is not on Kadafis side, it wont always be on the side of Obama, Cameron and Sarkozy either. Their publics are already unhappy about the cost of another military commitment. NATOs stature wont be enhanced by a stalemate at the hands of one of the Arab worlds least impressive armies. The war has caused friction inside the alliance as Europeans pressed for more U.S. involvement and the Obama administration sought less. But having committed themselves to overthrowing Kadafi, Obama, Cameron and Sarkozy cant back off now. In 1999, President Clinton bombed Serbia for 78 days before the government in Belgrade agreed to withdraw its troops from Kosovo. This war has run for only 37 days, officials say; give us time. What they dont mention is that before Serbia capitulated, Clinton concluded that he could not let the war go on forever, and he asked aides to prepare options for sending U.S. ground troops into battle. Obama and Gates have been firm in rejecting American ground troops in Libya; this time, thats a question for Cameron, Sarkozy and other Europeans. Before this war reaches its 78-day mark in early June, they will almost surely need to escalate it further, both to bring Libyas agony to an end and to avoid adding their own jobs to the casualty lists. Los Angeles Times