SB 6.11.8
mamarda padbhyam sura-sainyam aturam
nimilitaksam rana-ranga-durmadah
gam kampayann udyata-sula ojasa
nalam vanam yutha-patir yathonmadah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
As the demigods closed their eyes in fear, Vrtrasura, taking up his trident and making the earth tremble with his great strength, trampled the demigods beneath his feet on the battlefield the way a mad elephant tramples hollow bamboos in the forest.