Early American Wars Timeline By KayleeSGreen Apr 19, 1775 The Battles of Lexington and Concord The first battle of the Revolutionary War Sep 12, 1814 The Battle of Baltimore This navel battle showed the British that the United States could hold its own. Feb 15, 1898 The sinking of the USS Maine The ship was sunk in the Havana, Cuba harbor. This contributed to the war against Spain. Mar 3, 1931 The Adoption of the Star Spangled Banner as the National Anthem Woodrow Wilson