My 5th Grade Teacher said I Plagiarized this Poem I wrote about George Washington

Well here goes if anyone is interested for Presidents day

George Washington the General of the Army
Marching down with his Great White Horse-
Looking at his Brave Strong soldiers
Beat the Drums and lets begin the War
Men Fight like Lightning, Cannonballs falling from the sky
the American Flag rises higher and higher
And the Redcoats have been Denied

might have tweeked it a bit , wrote it down the best that I can remember .This was in 5th grade