Final answer:
The historical clues about the truce of 1914 come from letters, diaries, official reports, and photographs.
Step-by-step explanation:
The historical clues that tell us about the truce of 1914 come from various sources such as letters, diaries, official reports, and photographs. These primary sources provide firsthand accounts and evidence of the truce. For example, soldiers wrote about the spontaneous ceasefire and fraternization between enemy troops in their letters and diaries. Photographs taken during the truce show soldiers from opposing sides mingling and playing football together.
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