claim: Ang Lee is solely a television director.
evidence: John Lawrence Grattan -LRB- June 1 , 1830 -- August 19 , 1854 -RRB- was a mid-19th century US Cavalry officer , whose poor judgement and inexperience led to the Grattan massacre , which was a major instigator for the First Sioux War .. US Cavalry. US Cavalry. Grattan massacre. Grattan massacre. First Sioux War. Sioux Wars