Jungle Questions from the FAQ (Comment / Question)
Q. When it says that a unit can attack if it moves onto a Jungle hex from an adjacent hex, does it have to start from an adjacent Jungle hex when the unit is ordered to move or can the unit come from any terrain? A. To battle when entering a Jungle hex, your unit must be adjacent to the Jungle hex when ordered. It does not matter what type of hex the unit moves from.
Q. When ordered by the Behind Enemy Lines card, if an Infantry unit moves three hexes into a Jungle hex, may it battle? A. No. Units must start in a hex adjacent to a Jungle hex to move onto the Jungle hex and still battle.