On 12 May the commander of III-2203 discovered that all trained crews had been moved to The Hague. Most of that day and the morning of 13 May were used to find a truck and fetch a replacement gunner and new munition from The Hague. In the afternoon the vehicle protected the headquarters of the 1st Infantry Division at Rijswijk. On 14 May the car supported an attempt to eliminate the largest remaining pocket of German airborne troops, that had gathered around Major-General Hans Graf von Sponeck at Overschie, together with a Landsverk M38 armoured car from "2e Eskadron Pantserwagens". During the advance the clutch of III-2203 malfunctioned and the car returned to Delft for repairs. Rejoining the fight in the afternoon, III-2003 first took a civilian, fled from the village, on board to point out the exact German positions. Shortly afterwards the attacking Dutch troops witnessed the devastating bombardment of Rotterdam, just south of Overschie. Continuing to advance nevertheless, the two armoured cars were suddenly hit by antitank rifle fire and returned to the Dutch lines. It transpired that the M39 had been penetrated twice low in the side hull armour, without the projectiles doing any damage or even being noticed; a third round had been stopped by the thin strip of reinforcing steel around the turret base that doubled the normal armour thickness. Rotterdam capitulating as a result of the carpet bombing, III-2203 was withdrawn to The Hague.