What is the setting of The Mostly True Adventures of Homer P. Figg by Rodman Philbrick?

The novel is set in the 1860s, during the Civil War. The novel begins in a small Maine town and moves through other towns in Maine before moving into New Jersey and Pennsylvania. The novel ends at Gettysburg, the notorious days in July during which the Battle of Gettysburg took place between the Confederate states and the Union.