Caleb Huse had a rough time exiting the U.S., since agitations were pitched to a fevered hight, and everyone was searching for Southern Rebels. Fearing for his life, Huse fled to Canada, after the quick stop in New York to get funding (in Gold!!) for the mission. With every Yankee port being tightly guarded, on account no one was authorized to embark for Great Britain, or the European continent, Huse quietly (but, not so "clandestinely") boarded a ship from a Canadian Port.
Why "not so "clandestinely?"
Because, a U.S. Senator engaged him in conversation - who, it seems, already KNEW about Huse's not-so-secret mission to Europe . . .