"That's what happened this morning," continued Dick.  "This fellow came sailing along as calm and cheeky as you please, and was having a bully time taking pictures of our positions.  At least I suppose that is what he was doing, as he evidently wasn't out looking for fight.  I thought it wouldn't do any harm to take a look at him, although I saw the machine had French markings.  I gave the signal, but of course he couldn't give the countersign.  I repeated it three times without getting an answer, and then I pitched into him.  That makes the thirteenth that I've brought down."