Heracles, accompanied by his nephew Iolaus, set out in a chariot for the marsh of Lerna, in the slimy waters of which he found her. He commenced the attack by assailing her with his fierce arrows, in order to force her to leave her lair, from which she at length emerged, and sought refuge in a wood on a neighbouring hill. Heracles now rushed forward and endeavoured to crush her heads by means of well-directed blows from his tremendous club; but no sooner was one head destroyed than it was immediately replaced by two others. He next seized the monster in his powerful grasp; but at this juncture a giant crab came to the assistance of the Hydra and commenced biting the feet of her assailant. Heracles destroyed this new adversary with his club, and now called upon his nephew to come to his aid. At his command Iolaus set fire to the neighbouring trees, and, with a burning branch, seared the necks of the monster as Heracles cut them off, thus effectually preventing the growth of more. Heracles next struck off the immortal head, which he buried by the road-side, and placed over it a heavy stone. Into the poisonous blood of the monster he then dipped his arrows, which ever afterwards rendered wounds inflicted by them incurable.
-page 239, Berens