Deimos mainly appears in an assistant role to his father, who causes disorder in armies.[citation needed] In theIliad, he accompanied his father, Ares, into battle with the Goddess of Discord,Eris, and his brotherPhobos (fear).[5] Deimos is also depicted on Agamemnon's shield alongside his brother Phobos.[6] In theShield of Heracles, Phobos and Deimos accompany Ares into battle and remove him from the field onceHeracles injures him.[7] The poetAntimachus, in a misrepresentation of Homer's account, portrays Deimos and Phobos as the horses of Ares.[8] InNonnus'sDionysiaca,Zeus arms Phobos with lightning and Deimos with thunder to frightenTyphon.[9] Later in the work, Phobos and Deimos act as Ares's charioteers to battleDionysus during his war against the Indians.[10]
In 1877, the AmericanastronomerAsaph Hall discovered the two satellites of the planetMars. Hall named the two moonsPhobos andDeimos. Deimos is the smaller of the two satellites.[11]
