Question !!!

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Anyone help me with a problem I'm having playing El Alamein please?
During play, I hit a button by mistake and a formation on the map showed arrows pointing to a unit, presumably the HQ.
Now, during play, whatever I do with the units in that formation, when I end the turn, the units move around of their own accord!
I've checked the hot-keys in the manual but can't see any that would explain what is happening?
Any help appreciated.
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