While attached to the U.S.S. Pampang, Catherwood was one of a shore party moving in to capture Mundang, on the island of Basilan, P.I., on the morning of 24 September 1911. Advancing with the scout party to reconnoiter a group of nipa huts close to the trail, Catherwood unhesitatingly entered the open area before the huts, where his party was suddenly taken under point-blank fire and charged by approximately 20 enemy Moros coming out from inside the native huts and from other concealed positions. Struck down almost instantly by the outlaws' deadly fire, Catherwood, although unable to rise, rallied to the defense of his leader and fought desperately to beat off the hostile attack. By his valiant effort under fire and in the face of great odds, Catherwood contributed materially toward the destruction and rout of the enemy.