4 is 'Strongest knights leave the Guardhouses to enter battle'.
The strongest knights will always leave the castle first to fill up spaces in the guardhouses. However, it is possible that relatively weak knights were sent out to your guardhouses because no stronger ones were available. Then after some time the knights in your castle have become stronger. By using (5) you can make one or two knights from each guard house return to the castle. This will create a 'pool' of knights - from this pool the strongest leave for the guardhouses and the weakest stay behind.
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