WordNet (r) 3.0 (2006):

lay into
    v 1: hit violently, as in an attack [syn: lam into, tear
         into, lace into, pitch into, lay into]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "lay into":
   ambush, assail, assault, attack, blitz, bushwhack, come at,
   come down on, crack down on, descend on, descend upon,
   draw first blood, fall on, fall upon, gang up on, go at, go for,
   harry, have at, hit, hit like lightning, jump, land on,
   lay about one, lay at, lay hands on, lay on, light into,
   make war on, mug, pitch into, pounce upon, pound, sail into,
   set on, set upon, square up, strike, surprise, swoop down on,
   take the offensive, wade into