 He resigned from the troop in 1896, but later regretted the decision and requested a commission as a colonel in the Expeditionary Force that went to Cuba in 1898.Grubb was also a colonel in the New Jersey National Guard.His main contribution came during the 1881 centennial celebration of the Siege of Yorktown, where he commanded the New Jersey regiment that won a ceremonial silver cup for being the best drilled unit.