Catalyst or triggering event
The title of the work itself is ironic; Henry wishes "that he, too, had a wound, a red badge of courage", echoing a wish to have been wounded in battle. The wound he does receive (from the rifle butt of a fleeing Union soldier), however, is not a badge of courage but a badge of shame.
Oral communication is spoken orally (through the mouth), like by talking or singing. Written communication is transmitted through written words, such as stories, blogs, etc.
Oral communication came first. People spoke before they wrote!
