Battle is 'Óðinn's storm'. With Víga-Glúmr's verse Snorri explains the 'extended' kenning (rekit): a man is periphrased at once by battle (Viðrir's storm) and weapon (the wand of slaughter = the sword), and such further-developed figures are called nýgervingar.
Orrosta er veðr Óðins, sem fyrr er ritat. Svá kvað Víga-Glúmr:
Battle is the storm of Óðinn, as written before. Thus spoke Víga-Glúmr:
Viðris veðr er hér kallat orrusta, en vöndr vígs sverðit, en menn stafir sverðsins. Hér er bæði orrosta ok vápn haft til kenningar mannins. Þat er rekit kallat, er svá er ort. Skjöldr er land vápnanna, en vápn er hagl eða regn þess lands, ef nýgervingum er ort.
Viðrir's storm is here called battle, and the wand of slaughter the sword, and the men the staves of the sword. Here both battle and weapon are used to periphrase the man. That is called rekit [driven/extended] when it is so composed. A shield is the land of weapons, and a weapon is the hail or rain of that land, if it is composed with nýgervingar [fresh figures].
Skaldic quotations
Víga-Glúmr (strid = Viðris veðr; man = stafr vandar)
Rudda ek sem jarlar, orð lék á því, forðum með veðrstöfum Viðris vandar mér til landa.
I cleared lands for myself of old, like the jarls — there was talk of it — with the storm-staves of Viðrir [Óðinn — warriors] of the wand [the sword].