Hate to break it to you, Comrade, but that is an official U.S. Defense Department painting depicting the Battle of Guilford Court House, based on eyewitness accounts of the battle, which absolutely was fought between two lines of Continentals and British Regulars.
And YES, by March 1781, Continental troops were well-uniformed and equipped by the French, with the so-called "lottery uniforms," contract hats with cockades, and Charleville Muskets with bayonets.
Yes, it was all fun and games until the dysentery or smallpox hit.