WW1 - Three Avro 504 British biplanes and the British bomber squadron on the ground preparing to carry out an aerial attack in Friedrichshafen, Germany. Commander Briggs' biplane, No. 874 is the headmost of the three, on the right of the photograph. Commander Babington's machine, No. 875, is in the middle. Lieutenant Sippe's machine, No. 873, the rearmost of the three is seen on the left.