Haicke Marinus Petrius Janssen and Willem Johannes Roos were convicted of spying. Haicke Marinus Petrius Janssen & Willem Johannes Roos Age:- 29 33 Date of Execution:- Friday, 30th July, 1915 Location of Execution:- Tower of London Hangman:- Shot Assistants:- Tried At:- The Guildhall, Westminster, London Trial Dates:- 16th - 17th July, 1915 Trial Judge:- Not Known Crime:- Spying
