Dramatic footage deadly firefight between American mercenaries and Somali pirates

Dramatic footage captures a deadly firefight between American mercenaries and Somali pirates as they try to hijack a cargo ship
Somali pirates tried to hijack a cargo ship attacking the vessel in speedboats

• Private security contractors hired to protect the cargo began shooting at them
• The guards saw off the pirates firing dozens of rounds from sub-machine guns 
• Dramatic footage captures the furious gunfight between the two boats
• Attack thought to have happened in 2012 but reemerged after hijacking in March