Following an ultimatum to withdraw German troops from Belgium, Britain declared war on Germany on 4 August 1914. Monday 4 August 2014 will mark the 100th anniversary of the start of Britain’s involvement in World War One. Front pages from the start of World War One The news that Britain had joined World War One featured prominently in many of the newspapers printed the following day.   Search newspapers from World War One   Here’s a selection of the newspaper …