_**A runaway slave joins the Union Army during the Civil War**_ Accompanied by his dog, Jack, a teen slave in Virginia (Benjamin Gardner) escapes his plantation at the outset of the Civil War and goes to Pittsburgh to see a struggling minister (Frank Kasy). They join the 102nd Pennsylvania Regiment and see lots of action. Louis Gossett Jr. narrates as the elderly version of the protagonist while Eddie Huchro is on hand as a seasoned corporal. Based by the book by Florence W. Biros, “Dog Jack” (2010) is a Civil War movie in the mold of “The Colt” (2005) and “Pharaoh’s Army” (1995), but…