Based on a true story, 4 US Navy Seals, Marcus Luttrell (Wahlberg), Michael Murphy (Kitsch), Danny Dietz (Hirsch) and Matt ‘Axe ‘ Axelson (Foster) are sent on a mission to kill a top Taliban leader who is responsible for the deaths of many American soldiers/marines. The 4 are highly trained soldiers who are quietly confident of their abilities without the usual swaggering cockiness.
As the title suggests, things do not go smoothly. The 4 are trapped in a gorge behind enemy lines with no communications to the outside world. As they try to move up to higher ground to enable the re-establishment of communication, they come under heavy fire. The gun battle that ensues is all too realistic and in unfamiliar terrain with no backup, there is little hope for these brave men.