Terrific material; terrible movie.

By the nineteenth century, Irish catholic soldiers had centuries of experience abroad, in the service of the British Empire, as well as in continental armies and across South America. Here, the St Patrick's Battalion, a largely Irish unit, defends Mexico in the Mexican-American War (1846-1848). There are complex subjects here – American imperialism and racism, patriotism and pan-religious loyalties – all in the period of the Great Famine (1845-1852). But the film is so melodramatic, so poorly produced, directed, and acted, that it’s difficult to trust any of it, even by the standards of historical accuracy in film.