First, concerning the unknown target: that happened to me a couple of times, when I took too long to choose my team. Had to press attack again and put the team back quicker.
Second, the never ending attack. Also happened to me, and I solved it by restarting the tablet.
Hope it helps
Can't fight in war in says unknown target
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Just as a reminder, while SGG does read these and will reply, this is primarily a player forum. If support is needed beyond what other players can do to assist, support can be contacted at the link below.
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Support was contacted, still investigating, the fight btw lasted after war ended 
At least they sent a small gift to all membersā¦ thx 
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