Arandor
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In Heroes of Might and Magic III, I sometimes overlooked it if almost all the resources were located behind a forest or mountain. In Heroes of Might and Magic V, it happened as well, but knowing about this issue in V, I always pay close attention and examine the map carefully. In III, you don't expect something like that and play less attentively. So, it might even happen more often in III.
Be strong. Believe