User blog comment:Harold Burned-Mane/The Truth about Ulfric Stormcloak/@comment-25207664-20151225134158/@comment-18750685-20151225145527

Ulfric was emprisoned and interrogated by Thalmor agents.

He broke and revealed crucial intelligence about the Imperial City.

Though it had already been sacked and looted by Dominion soldiers.

Ulfric ignited an uprising against Titus Mede II's Cyrodiilic Empire.

This divides Skyrim and weakens the Empire overall.

Thus making Ulfric an unaware, yet powerful agent of the Dominion.