Meanwhile, in France…
42 Squadron RAF, Greg’s future squadron, moves the 4½ miles (7 km) southwest from Trèzennes (aka Trezennes or Triezennes), just outside Aire-sur-la-Lys to Rely, Pas-de-Calais, on top of the low chalk hills to the southwest.
It was no doubt the continuing westward advance of German forces in Operation Georgette that occasioned the move to Rely, although by 25 April 1918 the line had practically been held some 6½ miles (10½ km) to the east of Trèzennes. For more on Georgette and the Spring Offensives in General, see: