When the Brock Monument exploded at Queenston Heights on 17 April 1840, the colonial authorities quickly decided upon the identity of the guilty culprit: the notorious Irishman, Benjamin Lett.  A follower of William Lyon Mackenzie, Ben Lett unleashed a campaign of terror and violence in the years following the failed 1837 Upper Canadian Rebellion.  To some, he was a Robin Hood figure, “the Rob Roy of Upper Canada” who continually evaded capture; to others, he was a dangerous rebel who needed to be stopped.