According to  Casualties of the German Air Service, Ltn.d.R Rudolf Grastorf was lost on 27 July 1916 over the Black Sea, while on the crew of SL10. 
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"A surprise attack is much more demoralising than any other form, and generally results in the person attacked diving or pulling the machine into such a position that it forms a most satisfactory target for the few seconds necessary to deliver a decisive blow. " - R. S. Dallas
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