Conversation so far:
What was Charles Willson Peale's role in the American Revolution?
Charles Willson Peale's enthusiasm for the nascent national government brought him to the capital, Philadelphia, in 1776, where he painted portraits of American notables and visitors from overseas.
What military achievements did Charles Willson Peale have?
Charles Willson Peale also raised troops for the War of Independence and eventually gained the rank of captain in the Pennsylvania militia by 1776, having participated in several battles.
What else did Charles Willson Peale do during the War of Independence nesides raising troops and participating in battle?
While in the field, Charles Willson Peale continued to paint, doing miniature portraits of various officers in the Continental Army.
Were Charles Willson Peale's portraits popular?
In January 2005, a full-length portrait of Washington at Princeton from 1779 sold for $21.3 million, setting a record for the highest price paid for an American portrait.

Question: What was his famous piece?
Self-contained rewrite: What was Charles Willson Peale's most famous piece?