Ghastly hand to hand conflict between British soldiers and frontiersmen with General Andrew Jackson. The last major battle of the War of 1812 was the Battle of New Orleans. On January 8th 7,500 British soldiers marched against 4,500 U.S. troops led by General Andrew Jackson. The British were defeated in just 30 minutes. The Treaty of Ghent, which ended the war, had been signed two weeks before, but the news had not yet crossed the Atlantic.