Written after a battle fought in approximately 1475, this poem may be the oldest work of literature from Siam. It features the earliest and most detailed description of a Siamese army, the most elaborate eulogy of an early Thai monarch, and a fascinating discussion of the concept of loyalty. Scenes of personal treachery, heroism, combat, and looting after victory give an absorbing image of early Siam. This translation shares the poem—esteemed in Thailand for its historical and literary importance—with a wider audience. Blank verse conveys the rhythm and atmosphere of the original, and annotations explain obscure words and concepts. An afterword analyzes form, content, and the poem’s literary and historical significance.