The Moros' use of local intelligence to mark target situations, coupled with a keen understanding of the tactical element of surprise made combating juramentado warriors difficult for Spanish troops during its long attempt to occupy the
Sulu Archipelago. In an era of warfare where body armor had become anachronistic, an unexpected melee attack with razor-sharp blades was a devastating tactic against veteran soldiers. Even when colonizers had time to draw weapons and fire on the charging attacker, the small caliber weapons commonly in use possessed no stopping power, bullets passing through limbs and torso, the juramentados' ritual binding working as a set of tourniquets to prevent the swordsman from bleeding out from wounds before accomplishing his purpose. In 1983, the American journalist
Daniel P. Mannix released an edited version of the autobiography of his father, Rear Admiral Daniel P Mannix the 3rd. The book, called
The Old Navy: The Glorious Heritage of the U.S. Navy, Recounted through the Journals of an American Patriot, included the following paragraph: "What finally stopped the Juramentados was the custom of wrapping the dead man in a pig's skin and stuffing his mouth with pork. As the pig was an unclean animal, this was considered an unspeakable defilement."
Vic Hurley, an American author who was a member of the
Philippine Constabulary, wrote the book
Jungle Patrol in 1938, arguing that Colonel Alexander Rodgers of the
6th Cavalry Regiment (brother of
Thomas S. Rodgers) had implemented the strategy of mass graves and pig entrails: After the
September 11 attacks on the United States, a number of American
urban legends began circulating that
John J. Pershing had ordered the
summary execution of captured enemies using bullets laced with pig blood, and whose bodies were placed in a mass grave filled with pig entrails. Dr. Frank E. Vandiver, professor of history at
Texas A&M University and author of
Black Jack: The Life and Times of John J. Pershing, said about the burial of juramentados with pig remains that he never found any indication that it was true in extensive research on his Moro experiences, and that such an event would be out of keeping with Pershing's character. Rather, most sources indicate the idea of using pigs was suggested to Pershing but he rejected it. Yet John Pershing did not say that he had ordered the practice, but that "the army had already adopted" the practice, and that "it was not pleasant", as he states quite clearly in his
Memoir: In the 2013 publishing of his
Memoir, a footnote cites a letter from Maj. Gen. J. Franklin Bell to J. Pershing: ==Similar practices==