NEW : Battle lasted 12 hours as hundreds of militants fired on outpost , official says . Eight U.S. troops , two members of Afghan National Security Force killed in fighting . Coalition forces say they called in airstrikes , repelled attack from militants . The last time American troops suffered so many casualties in a single day was July 13 , 2008 , when Afghan militants attempted to overrun a base in the village of Wanat , also in eastern Afghanistan . Score: 6
NEW : Battle lasted 12 hours as hundreds of militants fired on outpost , official says . Eight U.S. troops , two members of Afghan National Security Force killed in fighting . Coalition forces say they called in airstrikes , repelled attack from militants . Score: 6