It is hard to propose ideal solution not knowing party level (after all depending on character abilities, they may singlepartedly wipe out crucial opponents or... get wiped out in a random skirmish).
However, if possible try to underline personal aspect of the event - if they have any friends, relatives or business associates, they may get treated to goodbyes, farewell suppers, rousing oratories.
Also, field hospitals make for a great way to setting mood - scores of wounded, buzzing flies, overwhelming feeling of hopelessness. If you use it, PCs should be strongly motivated to bring the siege to an end.
Regards,
Ruemere
However, if possible try to underline personal aspect of the event - if they have any friends, relatives or business associates, they may get treated to goodbyes, farewell suppers, rousing oratories.
Also, field hospitals make for a great way to setting mood - scores of wounded, buzzing flies, overwhelming feeling of hopelessness. If you use it, PCs should be strongly motivated to bring the siege to an end.
Regards,
Ruemere