Books
A Call to Arms
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'The regiment will form hollow square! First and Third Squadrons, at the halt, left and right form!' A hundred and eighty dragoons in double rank began the manoeuvre that would transform the parade from extended line into a military amphitheatre.
( http://www.booksattransworld.co.uk/allanmallinson/website/bo... )


Poinsett’s Cavalry Tactics for Reenactors
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Each trooper quickly rejoins on the commander, or guidon, by the shortest route. Since a second charge may be ordered before all are back in place - the troopers should swing around the sides and join the formation from the rear so they do not block the front of the formation. Do not try to get back into your original position, just get into a double rank line formation as quickly as possible.
( http://www.secondcavalry.org/Cav Blue Book/11) Poinsett's (... )


British double rank line. (view original)
( http://www.desura.com/mods/mount-and-musket-battalion-mod/im... )

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Note added at 2 hrs (2011-08-03 15:20:49 GMT)
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Main Entry: rank
Function: noun
Etymology: Middle English, from Anglo-French renc, reng, of Germanic origin; akin to Old High German hring ring — more at RING
Date:14th century
1 a : ROW, SERIES b : a row of people c (1) : a line of soldiers ranged side by side in close order (2) plural : ARMED FORCES (3) plural : the body of enlisted personnel
(Merriam Webster’s 11th Collegiate Dictionary)


vrsta
2. (mil.) rank; postrojiti se u ~u to form a rank
5. row, line
(Morton Benson Dictionary)