Pre-War Provocation: The 1806 Murder Of Pierce....

...and the case of the Leander::

Source

The murder of [John] Pierce by order of a British naval officer although from the tranquillized and almost paralized state of public feeling it did not excite the same indignation as the massacre of Boston citizens by British troops before the revolutionary war yet it was no less an outrage upon humanity and national dignity than that barbarous deed. Source

Capt. Henry Whitby of the Leander was acquitted.