The Collaborative International Dictionary of English v.0.48:

laager \laa"ger\ (l[add]"g[~e]r or l[aum]"g[~e]r), n. [D., also
   leger. Cf. 2d Leaguer, Lair.]
   A camp, especially one surrounded by a circular formation of
   travelers' wagons for temporary defense. [South Africa]

   Syn: lager.
        [Webster 1913 Suppl.]

              Wagons . . . can be readily formed into a laager,
              a camp, by being drawn into a circle, with the
              oxen placed inside and so kept safe from the
              attacks of wild beasts.             --James Bryce.
        [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Laager \Laa"ger\, v. t. & i. [From Laager, n.]
   To form into, or camp in, a laager, or protected camp.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

laager
    n 1: a camp defended by a circular formation of wagons [syn:
         laager, lager]