Lewis and Clark was a group of men in the military, known as the Corps of Discovery and civilians. Led by their leader Meriwether Lewis and Lieutenant William Clark to explore the land obtained by the United States in 1803. Known as the Louisiana Purchase.
Next time use the dictionary to get some examples and learn how to write it in such manners. But, I will help you.
A.) The American Colonies were so entrenched to separate from the British.
B.) The soldiers of the American Colonies would run behind the British and attack from the rear flank.