The bunkers at Harlingen were part of the Atlantic Wall: the more than 6,000-kilometer-long German defense line from Norway to Spain. The Atlantic Wall is one of the largest structures of the 20th century.
The line was built during the Second World War between 1942 and 1945 to prevent an Allied invasion of the Western European mainland from the sea. The Atlantic Wall was a series of separate smaller and larger support points that could give each other fire support.
In many cases they consisted of bombproof bunkers, sometimes with a wall and roof thickness of at least two meters of reinforced concrete. Due to a lack of labour, equipment and fuel, only 510 bunkers of the planned 2000 had been built in the Netherlands. In the English Garden in Harlingen is a German bunker that was part of the Atlantic Wall. It concerns a Communications Command Post with which the Germans coordinated the Frisian coastal defences.
By 18 April, the whole province of Friesland had been liberated, except for the Wadden Islands. Compared to other provinces, there was little fighting in Friesland. Overall, the few thousand German troops who had been unable to escape from Friesland were defeated by the Canadians relatively quickly.
The commander of the Royal Canadian Dragoons, Lieutenant Colonel Landell, praised the actions of the resistance by stating that "Friesland liberated herself". While that may be a bit of an exaggeration, the actions of the Frisian resistance undoubtedly accelerated the liberation. And reduced the number of casualties on the Allied side.
At least 31 resistance fighters lost their lives in confrontations with German troops and their Dutch accomplices. At least eleven Canadians and one Frenchman were killed on the Allied side. Dozens of civilian victims were also killed in the fighting and shelling. The number of casualties on the German side is not known, but it is believed that the number ran into hundreds. With 320 destroyed and 4000 damaged homes and 80 destroyed bridges, Friesland was materially the least damaged province of the Netherlands.
Many German soldiers fled towards the western part of the country. The retreating German troops gathered mostly in Harlingen, Makkum and Lemmer. From there, they tried to get away by boat across the IJsselmeer or via the Afsluitdijk to North Holland. The Wadden Islands also became a refuge for collaborators and German soldiers. Here, liberation was longer in coming.
On the island of Terschelling, the last German troops were disarmed by a British artillery regiment on 29 May. Two days later, the British crossed from Terschelling to Vlieland, and the liberation of that island was also a fact. Ameland was liberated on 3 June.
Personnel from the infamous Scholtenhuis, the SD headquarters in Groningen, had entrenched themselves on Schiermonnikoog. After their departure on 31 May, there was a celebration on the island, in spite of the six hundred members of the occupying troops who still were there. Only on 11 June did the last German soldiers leave Schiermonnikoog, and then the whole province of Friesland was free.
Most Canadian units that had liberated Friesland continued the battle in Groningen and North Germany after 18 April. Their war ended on 8 May 1945, when the surrender of all German armed forces became effective.