The Collaborative International Dictionary of English v.0.48:

Travers \Trav"ers\, adv. [F. travers, breadth, extent from side,
   [`a] travers, en travers, de travers, across, athwart. See
   Traverse, a.]
   Across; athwart. [Obs.]
   [1913 Webster]

         The earl . . . caused . . . high trees to be hewn down,
         and laid travers one over another.       --Ld. Berners.
   [1913 Webster]