Weather conditions should be considered when fighting a battle. Unless they can be used to your advantage, you may wish to delay fighting until they improve. The prevailing weather is displayed prior to deployment so you can make an informed choice about fighting in certain conditions before joining battle. Wet conditions will affect the usefulness of missile weapons in single player battles. This means that fire arrows will not work (and therefore cannot be used by either side). Fatigued units also recover more slowly in wet weather or snow. It is also much more difficult to set a building or ship alight in the rain, and by the same token anything on fire will be extinguished more quickly due to the downpour. Mists and fog may occur close to ground level or the surface of water, affecting the range and accuracy of missiles. Enemy units (not ships) will be concealed if they are 600 metres away or further.