TRIGGER

'The smartest horse in the movies'

• Activate

• Armed gang member

• Buttermilk's companion

• Buttermilk's stablemate

• Cause

• Finger lever

• He ran under Rogers

• Initiate

• Roy Rogers' horse

• Roy Rogers's steed

• Set off

• Spark

• An act that sets in motion some course of events

• Lever that activates the firing mechanism of a gun