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I once experienced a similar lag – I was playing against the computer in a 1v1 match on Master difficulty. I was playing as the Dark Elves. I attacked an enemy Castle, broke down the wall, and attacked with 50 Blood Fiends against 8 Titans. The game showed that only 1 Titan was being killed. I was kicked back to the desktop, and when I clicked back into the game, all the Titans were dead.