Terrorists have been trying to mount ever-larger attacks on American facilities in Iraq, in order to gain greater media coverage and in the vain hope of scoring a major victory. The attack on Camp Gannon last week was one of these. USA Today has an account of the failed attack that describes one Marine firing well over a hundred rounds to stop two suicide bomber vehicles.
Also read the after-action review posted by Black Five about a failed attack on a civilian convoy where nine (9!) MPs from the 617th MP Company (KY National Guard) fought off an attack by approximately 30 terrorists, killing 24 and wounding and capturing the rest.
The terrorists can keep this up all they want – direct combat with the US military is the surest way for them to lose most quickly.