Dozens of ATF agents took cover , many behind Branch Davidian vehicles , and exchanged fire with the Branch Davidians .
An agent outside provided them with covering fire but was shot by a Branch Davidian and killed instantly .
Dozens of ATF agents took cover , many behind Branch Davidian vehicles , and exchanged fire with the Branch Davidian   .
An agent outside provided them with covering fire but was shot by a Branch Davidian and killed instantly .