The all-time prize for transmitting the fullest message with the greatest compactness must go to Sir Charles James Napier. In 1843, Napier quelled an uprising in the Indian province of Sind and announced his triumph via telegram to his commanders in London. All he wrote was the one word Peccavi.
"A Bilingual Pun is Twice the Fun,"
Word Ways: Vol. 30
, Article 6.
Available at: http://digitalcommons.butler.edu/wordways/vol30/iss1/6