During its service in the war, the 5th Infantry Regiment was actively pursuing forces of the Philippine Republican Army. The companies and various detachments of the regiment marched a total of over 15,426 miles and engaged in thirty-eight skirmishes and minor actions before hostilities ended in July, 1902. In areas under American control, it became necessary for the military to administer law. Sigerfoos served as judge-advocate on a number of military commissions throughout the year of 1901. One such commission met at Vigan, in the province of Ilocos Sur on Luzon, in June. The commission tried Noverto Pré, an insurgent army officer for "murder in violation of the laws and customs of war." Sentenced "to be hung by the neck until...dead," Pré's sentence was commuted to fifteen years of hard labor at a prison in Manila. The proceedings of this case, along with nine other murder trials in which Sigerfoos served as judge-advocate, was published in an extensive rebuttal by the War Department in response to allegations that the United States military was committing atrocities against Filipinos during the war. The War Department called the allegations "either unfounded or grossly exaggerated."