The commander of American and allied forces in Afghanistan told Congress on Tuesday that the military had had significant battlefield successes but that progress remained tenuous.

Besides well-reported advances in southern provinces, American and NATO forces have also been able to halt or reverse Taliban gains around the capital, Kabul, and even in the north and west of the country, Gen. David H. Petraeus, the top American commander in Afghanistan, said Tuesday.

Come December, when the president intends to assess his Afghan strategy, he will be able to claim tangible successes, General Petraeus predicted by secure video hookup from Kabul, according to administration officials. The general said that the American military would have substantially enlarged the "oil spot" - military jargon for secure area - around Kabul. It will have expanded American control farther outside of Kandahar, the Taliban heartland. And, the aides recalled, the general said the military would have reintegrated a significant number of former Taliban fighters in the south.

General David Petraeus claimed limited success this week in the war within a war over the Taliban's planting of roadside bombs, but official Pentagon data show the Taliban clearly winning that war by planting more bombs and killing many more United States and North Atlantic Treaty Organization (NATO) troops since the troop surge began in early 2010.

In an effort to introduce a story of "progress" into media coverage, General David Petraeus' command claimed last week that the Taliban are suffering from reduced morale in Marjah and elsewhere, despite evidence that the population of Marjah still believes the Taliban control that district.