Bunkers and other military buildings were constructed throughout the country, often disguised as civilian houses with false windows and even geraniums. A large bunker for the
Kampfcommandant, the highest military commander, was built across from the
Concertgebouw on
Museumplein in Amsterdam.
Detention camps German authorities detained Dutch residents for a variety of reasons, most often for being Jewish (see
The Holocaust) or suspected members of the
Dutch Resistance. The Germans also detained hostages (
gijzelaars) as leverage. In July 1940, 230 tourists from the
Dutch East Indies were arrested as reprisal for the detention of German citizens in the East Indies. Another group of Dutch citizens were detained for the same reason in September 1940, and the Germans began making lists of prominent Netherlanders who could serve as hostages in the future. The first organised detention camp on Dutch soil was
Kamp Schoorl, previously a Dutch army camp, on the coast. Prisoners of war and other detainees were temporarily held here before being transferred elsewhere or released. In the summer of 1941, the occupiers began establishing new camps. The most prominent were
Kamp Amersfoort and
Kamp Erika, which allowed the Germans to close Kamp Schoorl in October 1941. From December 1942,
Camp Barneveld housed higher-class Dutch Jews in favorable conditions. In 1943,
Herzogenbusch concentration camp was established in
Vught, the only
SS concentration camp outside of Germany. Traditional prisons were also heavily used—notably
Scheveningen prison, which had a German-built
block for political prisoners. 28,000 were held there during the occupation. Detention House I at
Weteringschans in Amsterdam also housed 25,000 prisoners. Some prisoners were detained indefinitely, while others were executed (often in reprisal for resistance attacks) or released for various reasons. In addition to local detainees, Kamp Amersfoort housed German prisoners of war from as far away as the Eastern front. The present-day Soviet Field of Honour in
Leusden includes the graves of 101 Soviet soldiers who died or were executed there. In 1942 the
Westerbork transit camp, previously built by the Dutch to process Jewish refugees from Germany, received its first trainload of detainees to be deported back to Germany. By far the most well-equipped camp, Westerbork featured a hospital, dental clinic, day care, and school. Despite these amenities, Westerbork was intended only as temporary accommodation before sending prisoners to concentration camps. Though relatively few people died in the Dutch camps, summary executions and torture were common, and large numbers of detainees (including
Anne Frank) died or were killed after being transferred to other camps.
Luftwaffe The Luftwaffe was especially interested in the Netherlands, as the country was designated to become the main area for the air force bases from which to attack the UK. The Germans started construction of ten major military air bases on the day after the formal Dutch surrender, 15 May 1940. Each of them was intended to have at least 2 or 3 hard surface runways, a dedicated railway connection, major built-up and heated repair and overhaul facilities, extensive indoor and outdoor storage spaces, and most had housing and facilities for 2000 to 3000 men. Each air base also had an auxiliary and often a decoy airfield, complete with mock-up planes made from plywood. The largest became
Deelen Air Base, north of
Arnhem (twelve former German buildings at Deelen are now national monuments). Adjacent to Deelen, the large central air control bunker for Belgium and the Netherlands, Diogenes, was set up. Within a year, the attack strategy had to be altered to a defensive operation. The ensuing air war over the Netherlands cost almost airmen (Allied and German) their lives and 6000 planes went down over the country, an average of three per day during the five years of the war. The Netherlands turned into the first line of western air defence for Germany and its industrial heartland of the
Ruhrgebiet, complete with extensive
flak, sound detection installations and later radar. The first German night-hunter squadron started its operations from the Netherlands. Some Luftwaffe men and women were involved in the Netherlands throughout the war.
Atlantic Wall The Netherlands was part of the
Atlantic Wall series of fortifications against an Allied invasion, with civilian infrastructure replaced en masse with military defenses. The two most secured locations were at and
IJmuiden, defending the river approaches to Rotterdam and Amsterdam, respectively. The greatest civilian impact came in
Scheveningen and
The Hague, where 135,000 residents were forcibly moved and their homes demolished German facilities in
IJmuiden,
Scheveningen, and
Terschelling are maintained at Atlantic Wall museums. The
Atlantic Wall, a gigantic coastal defence line built by the Germans along the entire European coast from southwestern France to
Denmark and
Norway, included the coastline of the Netherlands. Some towns, such as
Scheveningen, were evacuated because of that. In The Hague alone, 3200 houses were demolished and 2594 were dismantled. houses were cleared, and people were forced to move. The
Arbeitseinsatz also included forcing the Dutch to work on these projects, but a form of
passive resistance took place there with people working slowly or poorly.
Aerial battles The Netherlands lay directly between the UK and many strategic targets in Germany, so Allied bombers were a common sight and sound in the sky for the duration of the war—typically British bombing raids at night and American raids during the day. High-altitude bombers were the first
contrails that many Dutch residents had ever seen. The Germans in turn installed anti-aircraft batteries throughout the country, which continually panned the sky at night with searchlights and opened fire with guns and
flak upon spotting a plane. Aerial battles were spectacular sights on clear days, and flak debris, downed planes, and airmen (living or dead) rained down on Dutch soil.
Air raids sometimes targeted the Netherlands, such as an assault on the
Philips factory in
Eindhoven on 6 December 1942 which killed 148 civilians. These became more intense during
Operation Market Garden. An Allied raid on Arnhem on 17 September 1944 killed about 100 civilians, while a Luftwaffe counterattack against Eindhoven on 19 September killed 227 civilians and wounded 800. In addition, patrolling fighter planes would sometimes strafe opposing ground forces when spotted, putting civilian traffic at risk. Later in the war, the Germans launched
V1 flying bombs from The Netherlands against both England and Belgium. The first sortie against
Antwerp was launched from
Delft on 3 March 1945. These rockets flew as little as 900 meters overhead with a characteristic buzzing sound and often failed in flight, crashing in civilian areas—in one instance, twenty crashed in a single night. ==Holocaust==