A class of mechanics expresses my whole.
[5]
I am composed of seven letters.
My 6, 7, 4, was used in war.
My 6, 4, 5, 2, 3, 1, is a seat of war.
My 2, 7, 4, 3, is a useful animal.
My whole is loved by every true-hearted American.
[6]
My 4, 2, 7, 10, is a planet, a chemical combination, and a town.