Vandals spray painted graffiti, including a large swastika in a British cemetery and the Second World War of the Commonwealth in the Netherlands.
Random letters were written on many tombstones at the Mierlo Cemetery, near Eindhoven, in the south of the Netherlands.
The Commonwealth War Graves Commission (CWGC) said it was "dismayed" just days away from the damage to the site.
Later this month, Prince Charles will attend a Dutch commemoration of the Battle of Arnhem in 1944.
This will be part of the 75th anniversary of the liberation of the Netherlands by the Allies of the Nazi occupation.
Mierlo Cemetery is the burial site of 664 British and Commonwealth soldiers and a Dutch soldier.
The graffiti included "MH17 Lie" – a provocative hint to the destruction of Malaysia Airlines' MH17 flight on the east of Ukraine in July 2014, which claimed the lives of 298 people, including 19 Dutch.
International investigators concluded that the jet had been hit by a Russian-made Buk missile fired from an area held by Russian-backed separatists.
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Condemning the vandals, the CWGC declared "that it is distressing to notice the damage to the gravestones, behind each of these war graves is a human story of someone who gave his life while he was alive." He was on duty ".
A Dutch regional press service, Omroep Brabant, voiced the shock and Dutch indignation of vandalism.
One of his reporters said, "This is not just a little smear here, no, they have smeared everywhere."
"There is a smeared letter on almost all gravestones.
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A woman was shocked and in tears, claiming that her parents had helped to occupy Mierlo's cemetery for years.
"My heart is crying, here are buried boys of 17 and 18 who have released us."
Dutch police tweeted a call to the public for any information that may lead to the authors.