The Duke of Marlborough Signing the Despatch at Blenheim

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At the end of the battle The Duke of Marlborough was still in the saddle organising the pursuit of the broken enemy. Pausing for a moment he scribbled on the back of an old tavern bill a note addressed to his wife, Sarah: "I have no time to say more but to beg you will give my duty to the Queen, and let her know her army has had a glorious victory."

Source: Wikipedia