The weather on the Western Front continues to deteriorate and heavy fog prevents any flying before 11am.
However later in the day , 5 and 7 Squadron managed to bomb the locomotive sheds at Valenciennes. Lieutenant M. G. Christie (7 Squadron) from a height of 4,800 feet hit the sheds and rolling stock outside. 2nd Lieutenant G. G. A. Williams (5 Squadron) attacked the from 6,000feet hitting the sheds again with a 112lb.bomb. Two ammunition trains were hit and twenty trucks of shells exploded. This stopped all traffic at this junction at a vital time.
In addition to the attacks on the Valenciennes triangle there were other attacks further south. Seven aeroplanes of the Third Wing were diverted to attacks on the Douai-Cambrai-Roisel lines. The pilots reported that three l00lb bombs had hit the rails half-way between Cambrai and Douai and that a similar bomb hit the track between Cambrai and Roisel.
In the north the Royal Naval Air Service had been asked to co-operate in the general bombing of communications by attacking the junction at Courtrai. Two Caudrons reached the town and dropped four 65lb. bombs, but the visibility was too poor for pilots to judge the results.