three o'clock
`` We were making forts , '' he explained . `` Tim 's is down by the gate and mine is under the chestnut tree . We 've got a lot of ammunition made , too . '' School was out at three o'clock , and a good many of the teachers came upstairs to Miss Mason 's room to watch the fight from her windows . Only first and second grade pupils were supposed to take part , but the third and fourth grade children seemed naturally to drift in the direction of the piled up snowballs . `` We 'll help you make 'em , '' they offered . `` That 's fair enough , '' said Mr. Carter , who was to be referee .