On 11 May III-2203 was ordered to support an advance over the Delft-Rotterdam highway. At first this met little enemy resistance, the main problem being that the car was fired upon by a fighter aircraft, that the vehicle commander recognised as a Dutch Fokker G.1. Then several Junkers Ju 52s were encountered, that had landed on the road and were now used by the German airborne troops as cover in the open polder landscape. Of one undamaged plane the DAF M39 shot off the engine; another, stuck in a ditch, was put on fire by some 37 mm HE-shells, fired at distance. The fire generated an enormous black smoke cloud, forcing the armoured car to break off the attack. The armour of the car during the action easily deflected enemy machine-gun rounds. By noon most of the Dutch infantry was withdrawn to rest and eat; during the afternoon the armoured car again made a probing attack against the cluster of Ju 52s. The commander decided to hold his fire and approached within forty metres of the enemy position, to provoke a reaction. Suddenly the vehicle was hit from all sides by a hail of bullets, some of these penetrated the thinner turret armour. Now responding with its main gun and hull machine-gun the M39 forced the Germans to take cover, but the gunner suddenly reported: "I am wounded" and sagged bleeding to the floor of the fighting compartment. The car drove back to the Dutch positions to seek medical assistance for the gunner, who was hospitalised. At a civil garage in Delft some brake malfunction was repaired. Most ammunition had been expended.