In detail: The Battle of Trafalgar
England expects

Part of the legend of Trafalgar rests on a flag signal sent by Nelson to his fleet (left), the last before he ordered them to engage the enemy.

The rousing command was spelled out using sets of flags that corresponded to words in a code book, of which each ship had a copy.

Only "duty" was not included in the book, so had to be spelled out using the flags that represented each letter.

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