mosul offensive
Islamic State may use tens of thousands of residents to hold onto their last city stronghold in Iraq.
The fall of Mosul would effectively signal the defeat of the ultra-hardline Sunni group in Iraq.
Mosul is the last major stronghold of the Islamic State in Iraq.
They rejoice in finally being able to wear bright colors, speak their minds and laugh in public.
WHAT'S HAPPENING
A U.S.-led coalition will provide air cover for the Iraqi troops.