Mahabharata 12.99.35

12.99.35

vedī yasya tvamitrāṇāṃ śirobhiravakīryate |
aśvaskandhairgajaskandhaistasya lokā yathā mama || 35 ||

That warrior who in battle, causes a river of blood to flow, terrible and difficult to cross, having kettle-drums for its frogs and tortoises, the bones of heroes for its sands, blood and flesh for its mire, swords and shields for its rafts, the hair of slain warriors for its floating weeds and moss, the crowds of steeds and elephants and cars for its bridges, standards and banners for its bushes of cane, the bodies or slain elephants for its boats and huge alligators, swords and scimitars for its larger vessels, vultures and Kankas and ravens for the rafts that float upon it, that warrior who causes such a river, difficult of being crossed by even those that are possessed of courage and power and which inspires all timid men with dread, is said to complete the sacrifice by performing the final ablutions. That hero whose altar (in such a sacrifice) is strewn over with the (severed) heads of foes, of steeds, and of elephants, obtains regions of felicity like mine. The sages have said that that warrior who regards the van of the hostile army as the chambers of his wives, who looks upon the van of his own army as the vessel for the keep of sacrificial offering, who takes the combatants standing to his south for his Sadasyas and those to his north as his Agnidhras, and who looks upon the hostile forces as his wedded wife, succeeds in winning all regions of felicity.