I was playing the 1st battle after the tutorial (represented by the bottom right flag on the map) and after 5 or 6 turns i had only 2 buildings left to protect, and during the enemy's turn in his 4th phase of the battle (the fist icon), after one enemy unit attacked, the game wouldn't continue. The game didn't hang. All animations and all buttons worked. The enemy just wouldn't perform his final attacks thus ending his turn. There was nothing I could do but exit the battle.