Kidnapping plot issue that I've not considered

[Rhatkinson]

If the conspirators had been able to capture Lincoln on the way to the Soldier's Home as planned, how did they plan to get across the Navy Yard Bridge? Obviously, it was guarded 24/7, so I can't imagine how they thought that they would be able to get across with the most recognizable man in America sitting (tied up) in their carriage.

It's not as though carriages had some "secret" compartment to store a 6'4" man!

Heath