[Endoperez]

Longbowmen are exceptional. You can make your longbowmen even better by casting Wind Guide, or protect your front row by casting Arrow Fend.

You have stealthy spies (Bards), priests (Monks) and mages (Mothers of Avalon), as well as stealthy sacreds in the Wardens. If you find a druid province or a Brigands' Lair site, which are quite common, you can also recruit stealthy shortbowmen. You can also cast Call of the Wild and Call of the Winds, although a single casting won't do much against even mediocre PD. The werewolves from the first one can summon more wolves, so that's one way of getting stealthy meat-shields to keep your Wardens alive; just pay attention to the routing rules so that your stealthy force doesn't retreat.
Even if you don't want to bother with stealthy armies, Bards are exceptional in many ways. They can tell what sites your enemy has, increase unrest in his rich provinces, and when you siege an enemy castle a Bard can tell you who he has inside the castle waiting for your forces.

EDIT: had confused Mothers and Daughters.