Through Jungle and Desert Vol. 2: Memoir 44 Expansion - Rules of Play says:
Through Jungle and Desert, the second installment in Days of Wonders' second series of Memoir '44 Battle Maps, includes six standard pre-printed scenarios with historical background and special rules, one token punchboard, and two new decks of combat cards: a Jungle Combat Cards deck and a Desert Combat Cards deck. The Jungle's scenarios can be played separately or as a campaign, with each scenario outcome impacting the following one.
In addition, this expansion features two pre-printed Overlord scenarios that allow you to fight for Henderson Field in Guadalcanal or conduct a a huge desert battle that marks the beginning of the second battle of El Alamein in Operation Lightfoot.