Following a further reorganization increasing its strength to two tank battalions and three motorised infantry regiments, the division was sent to the Western Front to participate in the Battle of the Netherlands starting on 10 May 1940. Part of the 18th Army, which defeated The Netherlands in a grueling five days, 9th Panzer Division played an essential role in the German strategy. The division was the only German mechanized force allocated to 18th Army and was intended primarily to link up with airborne forces landed near Rotterdam and The Hague. On 12 May, the division was launched in the south of The Netherlands to exploit a breakthrough by German infantry divisions, quickly advancing to the Moerdijk bridges, which had been captured by Student's paratroopers. Before that, near Breda, the division split up, sending one battalion north over the Moerdijk bridges to try and enter the Dutch National Redoubt, Fortress Holland. On 13 May, however, during its first actual fighting of the campaign, the battalion suffered considerable losses in a failed assault on the centre of Dordrecht. On 14 May, the battalion stood ready to assault Rotterdam, but the Dutch surrendered the same day after a carpet bombing of that city's civilian centre by the Luftwaffe.