The Pentagon is pressing European and Arab allies to provide more troops and support for the war against the Islamic State.

The hope is that the horror of the Paris attacks — and the fear that more are coming — will compel them to get more deeply involved.

The call for help is driven by a hope to build on what the Obama administration sees as the beginnings of battlefield momentum in Iraq and Syria. It may also reflect a sense in the Pentagon that the campaign to defeat the Islamic State has advanced too slowly and requires more urgent and decisive military moves.

President Barack Obama has made clear the basic U.S. strategy is not changing. But Defense Secretary Ash Carter says it's time to reach out to allies.