The squad attended a memorial service and visited war graves.
Fast bowler Stuart Broad laid a stone cricket ball at the graveside of former Kent and England spinner Colin Blythe, who died at the Battle of Passchendaele in 1917.
"It’s important to take a step back from cricket at times and this visit was a deeply moving and humbling experience for all of the players and management," captain Andrew Strauss said in a statement from the England and Wales Cricket Board (ECB).
England begin the five-match Ashes series against Australia on July 8 in Cardiff.
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