How large is a battalion? 1000?
Seems to me if they're massed in one place, threatening Iraq, we should send them all to meet Allah.
More like 300 to 500. But keep in mind that the media can't tell a battalion from a brigade, or a regiment from a division. So if they meant to say 'brigade', I'd say that 4 brigades could easily total 6 to 8 thousand troops.
Still not enough to get more than a few miles before the Air Force wipes them out.