E. de Moerlose served with the 4/II/2. Aé equipped with Fiat CR.42 at the time of the German invasion of Belgium in May 1940.

On 14 May, the II^ème Group took into action its remaining serviceable aircraft to cover the retreat of the French 7th Armée from Fleurus. The two-hour sortie saw a bitter clash with the 8./JG3 in the Flerus area at 13.55 and one Bf 109E was claimed destroyed by Capitaine Jean de Callatay and another was damaged by 1^er Sergent Marcel Michotte. Also during this sortie Sergent de Moerlose claimed a damaged enemy Do 17. 8./JG3 claimed five of the Fiats during this combat. Claiming Luftwaffe pilots were Oberleutnant Wilhelm Gäth (victory no. 1 of 14), Oberfeldwebel Willi Bauer, Unteroffizier Rudolf Saborowski (victory no. 1 of 39), Unteroffizier Karl Flebbe and Unteroffizier Josef Keil (victory no. 1 of 16).
It seems that the Belgian unit didn't suffer any losses and it has not been possible to verify if 8./JG3 sustained any losses in this combat.

De Moerlose ended the war with one damaged enemy aircraft. This was claimed while flying biplanes.

Claims:

Kill no.	Date	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1940
	14/05/40	1	Do 17	Damaged	Fiat CR.42		Fleurus area	4/II/2. Aé

Biplane victories: 1 damaged.
TOTAL: 1 damaged.

Sources:
Luftwaffe Claims Lists - Tony Wood
Twelve Days In May - Brian Cull and Bruce Lander with Heinrich Weiss, 1999 Grub Street, London, ISBN 1-902304-12-8
Additional information kindly provided by Lars Larsson and Peter Taghon