While attached to the U.S.S. Pampang, Volz was one of a shore party moving in to capture Mundang, on the island of Basilan, P.I., on 24 September 1911. Investigating a group of nipa huts close to the trail, the advanced scout party was suddenly taken under point-blank fire and rushed by approximately 20 enemy Moros attacking from inside the huts and from other concealed positions. Volz responded instantly to calls for help and, finding all members of the scout party writhing on the ground but still fighting, he blazed his rifle into the outlaws with telling effect, destroying several of the Moros and assisting in the rout of the remainder. By his aggressive charging of the enemy under heavy fire and in the face of great odds, Volz contributed materially to the success of the engagement.