Islamic State responded in a video to US President Barack Obama’s vow to “ultimately destroy” it, promising to kill any American ground forces deployed. The extremist group has gained recruits since Obama’s declaration, according to observers in Syria.

The 52-second clip, released late Tuesday as a preview for a longer video, uses quick edits and high-resolution images to depict besieged American soldiers in the field, President George W. Bush’s ‘Mission Accomplished’ banner drop on an aircraft carrier mere weeks after the US invaded Iraq in 2003, and the White House at night.