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but I think I remember the story about Gen. Pershing having a number of Mohammetans executed and buried with pig renderings,

Claim: General John J. Pershing effectively discouraged Muslim terrorists in the Philippines by killing them and burying their bodies with pigs.
Status: Undetermined.
http://www.snopes.com/rumors/pershing.htm
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The history of the American administration of the Philippines between the Spanish cession of the islands at the conclusion of the Spanish-American war in 1898 and the attainment of full political independence in 1946 — including American attempts to "pacify" various independence-minded groups through military means — is too long and complicated to explicate here. Suffice it to say that General John J. "Black Jack" Pershing was part of the process as Governor of the troublesome Moro Province between 1909 and 1913. We haven't yet found any references to this alleged incident in Pershing biographies, however, nor does it match the way Pershing is generally recorded as having dealt with the Moros in 1911. When they refused to obey Pershing's order banning firearms by surrendering their weapons, his response was to draft a letter to the Moros expressing sorrow that his soldiers had to resort to killing to enforce the order:

I write you this letter because I am sorry to know that you and your people refuse to do what the government has ordered. You do not give up your arms. Soldiers were sent to Taglibi so that you could come into camp and turn in your guns. When the soldiers went to camp a Taglibi, your Moros fired into camp and tried to kill the soldiers. Then the soldiers had to shoot all Moros who fired upon them. When the soldiers marched through the country, the Moros again shot at them, so the soldiers had to kill several others. I am sorry the soldiers had to kill any Moros. All Moros are the same to me as my children and no father wants to kill his own children . . .
When negotiations stalled and matters came to a head, Pershing was still reluctant to be responsible for any more loss of life than was necessary:

[Vandiver, 1977]
[Pershing] went to his offices on [14 December 1911] only to hear a message from the Sulu district governor: hundreds of hostiles gathered on Jolo's Bud Dajo! The message had dread portent. Mount Dajo, awesomely high and capped with the creater of an extinct volcano, meant sacred things to Moros. It was the refuge against fate, the last bastion of the hopeless, the place where their ancestors stood off great waves of enemies. Once on the mountain, esconced in its big cotta, Moros would die gladly, as Leonard Wood had grimly learned. Retreat to Dajo meant a clear declaration of war.

Sobered and depressed, Jack wrote of an overriding worry: "I am sorry these Moros are such fools, but . . . I shall lose as few men and kill as few Moros as possible." Memories of Wood's massacre of men and families on Dajo rankled in the army and still bothered the chief of staff. Obviously another such slaughter in the winter of 1911 could adversely influence the 1912 elections in the States.

Pershing's strategy was to surround the Moros and wait them out while attempting to induce them to surrender, a strategy that worked effectively: the Bud Dajo campaign ended with only twelve Moro casualties. But in his report Pershing seemed keenly aware that the best approach was not to take any action that would encourage religious fanaticism:

There was never a moment during this investment of Bud Dajo when the Moros, including women, on top of the mountain, would not have fought to the death had they been given the opportunity. They had gone there to make a last stand on this, their sacred mountain, and they were determined to die fighting . . . It was only by the greatest effort that their solid determination to fight it out could be broken. The fact is that they were completely surprised at the prompt and decisive action of the troops in cutting off supplies and preventing escape, and they were chagrined and disappointed in that they were not encouraged to die the death of Mohammedan fanatics.
Other anecdotal accounts attribute Pershing's success to his merely threatening to do as described:

Col. John J Pershing threatened the mullahs with . . . "splattering of pigs-blood on your houses and families and any who attack us and are killed will be buried in pig-skins." Consequently the mullahs made Pershing an Honorary Chieftan with little if any more trouble in his area of command.
Yet another account, from the 1938 book Jungle Patrol, attributes the deed to someone other than Pershing:

It was Colonel Alexander Rodgers of the 6th Cavalry who accomplished by taking advantage of religious prejudice what the bayonets and Krags had been unable to accomplish. Rodgers inaugurated a system of burying all dead juramentados in a common grave with the carcasses of slaughtered pigs. The Mohammedan religion forbids contact with pork; and this relatively simple device resulted in the withdrawal of juramentados to sections not containing a Rodgers. Other officers took up the principle, adding new refinements to make it additionally unattractive to the Moros. In some sections the Moro juramentado was beheaded after death and the head sewn inside the carcass of a pig. And so the rite of running juramentado, at least semi-religious in character, ceased to be in Sulu. The last cases of this religious mania occurred in the early decades of the century. The juramentados were replaced by the amucks. .. who were simply homicidal maniacs with no religious significance attaching to their acts.
We haven't eliminated ruling out the possibility that Pershing at some point chose to deal with a group of "Mohammedan fanatics" in a manner similar to the one described above, but so far all we've turned up are several different accounts and nothing that documents Pershing's involvement.

Nonetheless, the "discouraging Muslim terrorists by burying them with pigs" concept is still invoked today, even if the evidence of its use (or success) remains nebulous:
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