アイルランドの伝説では、バッブは戦争と死に関連しており、差し迫った流血を予感させるために現れたり、戦いに参加して兵士の間に混乱をもたらしたりしている。バズヴは運命の前触れとして、さまざまな姿で登場する。『Togail Bruidne Dá Derga』では、醜い老婆の姿をしており、コナ・モールの没落を予言する<ref name="Culture">Koch, John T., Celtic Culture: a historical encyclopedia, ABC-CLIO, December 2005, Santa Barbara, Calif., page220 , isbn:978-1-85109-440-0</ref>。『Togail Bruidne Dá Choca』にも同様の姿で登場し、コーマック・コンドロイングの殺害を予言している。また、「浅瀬の洗濯女」の姿でも登場し、死の前兆とされる浅瀬でコーマックの戦車と馬具を洗う女性の姿も見せている<ref name="Culture" /><ref name="Symbols">Davidson, Hilda Ellis, Myths and Symbols in Pagan Europe: early Scandinavian and Celtic Religions, Syracuse University Press, 1988, Syracuse, NY, page99, isbn:978-0-8156-2441-7</ref>。バズヴの鳴き声もまた、不吉な予兆なのだろう。コーマックの死が間近に迫っていることは、「口の赤いバズヴは家の中で泣きわめき、/死体のために気をもむだろう」、「青白いバズヴは悲鳴をあげるだろう」という言葉で予兆されているのである<ref name="Ancient">Hennessy, W. M., "The Ancient Irish Goddess of War", ''Revue Celtique'' 1, 1870–72, pp. 32–37</ref>。この役割において、彼女は豆シデと共通点が多い<ref name="Dictionary">Mackillop, James, A Dictionary of Celtic Mythology, Oxford University Press, 2004, New York, page30, isbn:978-0-19-860967-4</ref>。
また、戦場で活躍する姿もよく描かれており、実際に戦場は「バズヴの庭」と呼ばれることもあった<ref name="Heroes">Sjoestedt, Mary-Louise, Celtic Gods and Heroes, Dover Publications, 2000, Mineola, NY, page32, isbn: 978-0-486-41441-6 (reissue of ''Gods and Heroes of the Celts''. London: Methuen, 1949)</ref>。
She was also regularly depicted as an active participant in warfare; indeed, the battlefield was sometimes referred to as "the garden of the Badb".<ref name="Heroes">{{cite book | author=Sjoestedt, Mary-Louise | title =Celtic Gods and Heroes | publisher = Dover Publications | year =2000 | location= Mineola, NY | page =32 | isbn = 978-0-486-41441-6}} (reissue of ''Gods and Heroes of the Celts''. London: Methuen, 1949)</ref> During the [[Cath Maige Tuired|First Battle of Mag Tuired]], Badb—along with her sisters, Macha and Morrígan—fights on the side of the [[Tuatha Dé Danann]]. Using their magic, the three sisters incite fear and confusion among the [[Fir Bolg]] army, conjuring "compact clouds of mist and a furious rain of fire" and allowing their enemies "neither rest nor stay for three days and nights".<ref name="FirstBattle">Fraser, J. (ed. & trans.), [http://www.maryjones.us/ctexts/1maghtured.html "The First Battle of Moytura"] {{Webarchive|url=https://web.archive.org/web/20090504180957/http://www.maryjones.us/ctexts/1maghtured.html |date=4 May 2009 }}, ''[[Ériu (journal)|Ériu]]'' 8, pp. 1–63, 1915</ref> Badb plays a similar role in the [[Táin Bó Cúailnge]], terrorising and disorienting the forces of [[Medb|Queen Medb]] and causing many to fall on their own weapons.<ref name="Ancient" /> She would often take the form of a screaming raven or crow, striking fear into those who heard her,<ref name="Oxford">{{cite book | author=Leeming, David | title=The Oxford Companion to World Mythology | publisher=Oxford University Press | date=November 2007 | location=New York | isbn=978-0-19-515669-0 | url-access=registration | url=https://archive.org/details/oxfordcompaniont0000leem }}</ref> and could also be heard as a voice among the corpses on a battlefield.<ref name="Culture" />
Following the defeat of the [[Formorians]] by the [[Tuatha Dé Danann]] in the [[Cath Maige Tuired#The Second Battle of Mag Tuired|Second Battle of Mag Tuired]], Badb (or the Morrígan daughter of Ernmas)<ref name="CMT167"/> instead of predicting doom, now sings a prophecy celebrating the victory and a time of peace,