to attack the enemy castle, special click on it and then click the crossed swords, use the +,- to change the number of knights u send.
Its totally the same as for attacking knights huts but it doesnt have a distance marker flag (with the black crosses etc)
So, 'probably' its just too far away at the moment for u to attack you need to be fairly close (so if it had a flag it would be thick black cross)
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