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ArgumentOutOfRangeException via counter-attack option
Encountered ArgumentOutOfRangeException in file: EuropeEngulfedNETForm, method: europeEngulfedMapControl_MouseDown(), line: playingPieceBeingDragged = (PlayingPiece)GSUList[indexGSUSelected];
After indicating I wanted to counter-attack in the Rhineland by the Axis, I clicked the Rhineland territory and this exception occurred.
indexGSUSelected = -1