A hundred years ago families across the country saw their partners, sons and brothers go to war. More than 8 million people served in the British Army - among them were thousands of Jewish soldiers.
As an exhibition about their role in the conflict gets ready to open, our Senior Correspondent Ronke Phillips has been to meet one man whose grandfather documented his time in the trenches.
The exhibition is called 'For King and Country?', and opens at the Jewish Museum in London on 19 March.