(REUTERS) – The declining effectiveness of Islamic State attacks against Iraqi forces in eastern Mosul suggests the militants are starting to run out of resources with the campaign in its third month, a U.S. general told Reuters.

Since the U.S.-backed offensive began on Oct. 17, elite troops have retaken a quarter of the city in the biggest ground operation in Iraq since the 2003 U.S.-led invasion that toppled Saddam Hussein. Prime Minister Haider al-Abadi has said the group will be driven out of the country by April.

The second phase of the campaign, launched last week following nearly a month of deadlock, has pushed Islamic State out of several more areas in eastern Mosul despite fierce resistance. Iraqi forces have yet to enter the west.

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