Sale has ended but you can still get this app.
Download Fall of Stalingrad Now

Official Description

+ When replacement resource selected, unit types able to receive +1 HP will have yellow edges (if not max HP already)
+ More Tactical Routes, more rear area movement, easier to automatically move multiple hexagons at once (select rear area unit, tap 2-6 hexagons away)
+ Setting: Randomly and secretly make X units from each side both a hero unit and a coward unit. Those units get either a 0-50% combat bonus or penalty, respectively. Default ZERO.