Hollow square

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See Square.
(Mil.) a formation of troops in the shape of a square, each side consisting of four or five ranks, and the colors, officers, horses, etc., occupying the middle.

See also: Hollow, Square

References in classic literature ?
When soldiers form lines, or hollow squares, you call it reason.
On the other hand, the houses themselves are hollow squares; all the rooms opening into a neat little courtyard.
Soldiers, wheel into a hollow square! Ho, good people!
There must have been from six to eight dozen spoons in the Brigade, and they marched away in the shape of a hollow square, with Dorothy, Billina and Toto in the center of the square.
We made a most imposing and awe-inspiring spectacle as we strung out across the yellow landscape; the two hundred and fifty ornate and brightly colored chariots, preceded by an advance guard of some two hundred mounted warriors and chieftains riding five abreast and one hundred yards apart, and followed by a like number in the same formation, with a score or more of flankers on either side; the fifty extra mastodons, or heavy draught animals, known as zitidars, and the five or six hundred extra thoats of the warriors running loose within the hollow square formed by the surrounding warriors.
So they went on and on, up this line, down that, round the exterior of this circle, and on every side of that hollow square; and still there were lines, and squares, and circles out of number to review.
Following him in, they found that the house was a hollow square, enclosing a courtyard with a bath sunk in the middle, and a fountain in the centre of the bath.
In the battle that followed, Napoleon's blunt attacks, using heavy cavalry and infantry in columns, met their match in Wellington's defensive formations of lines and hollow squares that enabled British infantry to withstand the shock of cavalry charges.