London's famous Tower Bridge lifted to allow the Belgian navy frigate Louisa Marie to sail up the River Thames and deliver the soil to the British warship HMS Belfast.
The bags of soil, which were gathered by more than 1,000 British and Belgian schoolchildren earlier this year, will be placed in a new memorial garden at Wellington barracks in central London tomorrow.
Queen Elizabeth II's husband Prince Philip, 92, was presented with the soil in a ceremony in the Belgian town of Ypres earlier this month, to remember the tens of thousands of Commonwealth soldiers who died in the 1914-18 war.
Lance Sergeant Michael Moran, who helped transfer the soil to the British warship, said the events to mark the centenary of World War I helped to bring "closure".
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"I've done two operational tours of Afghanistan but what those soldiers went through in the First World War was far worse. Those were real men," he said.
"When the garden is complete it will be a quiet place to go and pay respects to all those lost in the Great War fighting for our freedom."