EE WAS HAMMERING A SLIDE GATE INTO CLOSED POSITION WHEN THE HAMMER GLANCED OFF THE EDGE OF THE GATE. AS HAMMER GLANCED OFF THE GATE HAND WAS PULLED FORWARD AND LEFT INDEX FINGER WAS SMASHED BE TWEEN HANDLE OF HAMMER AND STTEL SLIDE GATE. EE WAS WEARING GLOVES WHILE USING HAMMER. EE REQUIRED STITCHES TO CLOS WOUND AND LOST FINGERNAIL.