In English cuisine, battalia pie (obsolete spelling battaglia pye) is a large game pie, or occasionally a fish pie, filled with many small "blessed" pieces, beatilles, of offal, in a gravy made from meat stock flavoured with spices and lemon. The dish was described in cookery books of the 17th and 18th centuries.
Confusion with words for battle led to the pie being crenellated, or shaped to resemble a castle with towers.
A battalia pie was so named because it was filled with beatilles, small blessed objects (from Latin beatus, blessed) such as, according to the Oxford English Dictionary, "Cocks-combs, Goose-gibbets, Ghizzards, Livers, and other Appurtenances of Fowls (1706)". It is not connected with Italian battaglia, battle, but it was regularly confused with that meaning, and battalia pies were built with crenellated battlements around the edges, and sometimes as castles complete with towers.
The 1658 cookery book The Compleat Cook by "W. M." gives an early recipe for battalia pie:
Take four tame Pigeons and Trusse them to bake, and take foure Oxe Pallats well boyled and blanched, and cut it in little pieces; take six Lamb stones, and as many good Sweet breads of Veale cut in halfs and parboyl'd, and twenty Cockscombs boyled add blanched, and the bottoms of four Hartichoaks, and a Pint of Oysters parboyled and bearded, and the Marrow of three bones, so season all with Mace, Nutmeg and Salt; so put your meat in a Coffin of Fine Paste proportionable to your quantity of meat; put halfe a pound of Butter upon your meat, put a little water in the Pye, before it be set in the Oven, let it stand in the Oven an houre and a halfe, then take it out, pour out the butter at the top of the Pye, and put it in leer of Gravy, butter, and Lemons, and serve it up.
In his 1660 cookery book The Accomplisht Cook, Robert May gives a recipe "To make a Bisk or Batalia Pie", which instructs:
Take six peeping Pigeons, and as many peeping small chickens, truss them to bake; then have six oxe pallets well boil'd and blancht, and cut in little pieces; then take six lamb-stones, and as many good veal sweet-breads cut in halves and parboil'd, twenty cocks-combs boil'd and blanch'd, the bottoms of four artichocks boiled and blanched, a quart of great oysters parboil'd and bearded, also the marrow of four bones seasoned with pepper, nutmeg, mace, and salt; fill the pye with the meat, and mingle some pistaches amongst it, cock-stones, knots, or yolks of hard eggs, and some butter, close it up and bake it (an hour and half will bake it) but before you set it in the oven, put into it a little fair water: Being baked pour out the butter, and liquor it with gravy, butter beaten up thick, slic't lemon, and serve it up.