Dundalk’s camp highlights how military outcomes in 1689 depended not only on battlefield decisions but on weather, supply systems, medical knowledge and relations with civilian communities. Schomberg’s multinational army possessed impressive international backing, yet its autumn losses show the limits of mobilisation when food, shelter and sanitation failed. This contrasts with the ambition of James’s Dublin parliament, which sought to reshape landholding and authority while war disrupted life. To what extent should Dundalk’s suffering be understood as a failure of command, an unavoidable feature of seventeenth-century campaigning, or evidence that logistics and resources were decisive as combat in determining Ireland’s?