ok. this question doesn't really open up (at least not for me)
Do you mean that you get attacked from every side (front + both flanks + rear?) if that is the you get one flank and one rear for the purpose of combat resolution.
Having any number of units in the front arc engaged in close combat doesn't generate any static combat resolution and remember that you can only use the best rank bonuses (so no stacking for multiple deep units) and only one banner.
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High Elves since Aug 2010: Tot /W / L / D - 100 / 75 / 23 / 2
Tomb Kings since Sep 2013:Tot / W / L / D - 31 / 18 / 12 / 1
Chronicles of Loriel's Glory and Shame