[Valandil]

Alternatively, avoid them. Cloud Trapeze/Flying Raksharajas can probably take giant PD, seducers can grab undefended provinces with skelspam, and eventually kill even jarls with disintegrate. Use overwhelming force of mages to kill one army at a time, while raiding like crazy.

Honestly, After turn 35 or so, standards of the damned, drain life spells, hellbind hearts, disintegrates, and even life for a life, should mean that you can weather a pure giant army. 'Course, your opponent is reasearching too.

N9 W9 Palankashas work pretty well, too.

Caveat: I can't play this game. At all.