Air force and naval air stations remained frequent targets of Luftwaffe activity. German formations were routinely sent on "free hunt" missions over designated operational areas, with the Dutch coastal sectors continuing to attract particular attention..
Flushing Air Force Base came under attack once again on this third day of the campaign. A French anti-aircraft battery equipped with six Hotchkiss 25 mm guns had taken up positions in Flushing and was able to reinforce the airfield's defences. Both the French and Dutch anti-aircraft batteries were kept busy by the Luftwaffe, which was particularly active over the Flushing area, especially during the morning hours.
The Dutch air force commander submitted a request to evacuate the airfield. He argued to his superiors that the training aircraft and their crews could contribute little to the war effort under the prevailing circumstances and would be of greater value if transferred to France or even England. The request was denied.
Late in the evening, Flushing Air Force Base was attacked by two or three Heinkel He 111 bombers, which dropped several dozen 50-kg bombs on the airfield. Panic ensued, and many soldiers from the infantry units assigned to guard the base fled their positions, returning only hours later. The loss of discipline continued to affect morale, and over the following days a number of deeply troubling incidents would occur..
At 1500 hours, the naval seaplane base at Veere was attacked by Heinkel He 111 bombers. The attackers concentrated their efforts on the six moored Fokker C.XIV-W naval reconnaissance seaplanes, two of which were non-operational reserve aircraft. The base was defended by an anti-aircraft platoon and three Hispano Suiza 20 mm naval anti-aircraft guns, but despite their efforts they were unable to prevent the destruction of one seaplane and damage to another.
A tragic friendly-fire incident claimed the lives of two Naval Air Service personnel later that evening. A non-commissioned officer and a sailor were shot and killed by members of the base security detachment, who mistakenly believed that German airborne troops were attempting to infiltrate the installation. It was one of many such incidents that occurred throughout the country during those tense days of fighting. Nervous sentries, quick to pull the trigger yet often accurate in their fire, repeatedly engaged their own troops. These tragic mistakes resulted in dozens of casualties nationwide.
At Haamstede Air Force Base, on the island of Schouwen-Duiveland, panic remained the defining feature of the situation.
The airfield had been attacked by German bombers the previous day, and the resulting unrest among the troops had only partially been brought under control. Persistent rumours of German landings and airborne troops on the island continued to unsettle the garrison. Numerous patrols were dispatched to investigate these reports, but time and again they returned to headquarters without finding any evidence to substantiate the claims.
On this third day of the war, however, the Germans failed to make an appearance.
At approximately 2000 hours, three Heinkel He 111 bombers were intercepted and shot down in the vicinity of Roosendaal. The aircraft had been engaged in attacks against French forces operating near the town. One of the bombers, belonging to 2./Kampfgruppe 126, was probably brought down by a Morane-Saulnier M.S.406 fighter..