"It was an odd coincidence that the completed statue (monument of Queen Luise) left Rome on July 19th, the day of the Queen's death. But England in that year was at war with the United States, and so it happened that a Yankee privateer overhauled the British merchantman, too her prisoner, and sailed away with her precious cargo. But the captured merchantman was in turn chased and overhauled by the English privateer Elisa, so that once more the monument of Queen Luise sailed under the British flag."
The statue reached Berlin May 22, 1815.
An interesting blog post, Napoleon's Beautiful Enemy: Queen Louise of Prussia, can be seen here.