Due to the outbreak of war in the summer of 1914, Derfflinger was forced to conduct her trials in shallow waters close to Germany; in deeper water an additional 2 knots (3.7 km/h; 2.3 mph) was possible.
由于战争于1914年夏天爆发，德夫林格号被迫在靠近德国的浅水区进行海试；在更深的水域中则有可能额外提升多2節（3.7公里每小時）。