Chopper vs. Monsters is a side mission in Infamous 2.
The mission starts when a civilian approaches Cole and informs him that the Militia are in a big battle with the Corrupted, which is producing huge collateral damage, killing innocent civilians. Cole must find the battleground and deal with the situation. At the site of the battle, Cole will find several Militia and a Militia chopper fighting a horde of swamp monsters, whom Cole must fight. The mission is complete when all enemies have been defeated.
Upon completion, Cole receives 100 XP and slightly reduces enemy activity in New Marais.