The Collaborative International Dictionary of English v.0.48:

Leaguer \Lea"guer\, n. [D. leger camp, bed, couch, lair. See
   Lair, and cf.Beleaguer.]
   1. The camp of a besieging army; a camp in general. --b.
      Jonson.
      [1913 Webster]

   2. A siege or beleaguering. [R.] --Sir W. Scott.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Leaguer \Lea"guer\, v. t.
   To besiege; to beleaguer. [Obs.]
   [1913 Webster]