When soldiers rest, they form the formation which called "circle". In US this is called "assembly". I maight say that formation's weakpoint is corner. In case of circle, as you know, there is no corner. So if soldires were attacked, the damege would be minimum.
Basically, when we don't know what is enemy's target or object, "circle" is also formed.
"Circle" has been used by every Militaly.
This formation is too small. But "circle" is like this picture.
Interesting, as a kind of formation for many situations. Not for attacking, but for resting or in unsure circumstances.
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