On January 14 , 1836 , Crockett and 65 other men signed an oath before Judge John Forbes to the Provisional Government of Texas for six months that said `` I have taken the oath of government and have enrolled my name as a volunteer and will set out for the Rio Grande in a few days with the volunteers from the United States . '' On January 14 , 1836 , Crockett and 65 other men signed an oath before Judge John Forbes to the Provisional Government of Texas for six months : `` I have taken the oath of government and have enrolled my name as a volunteer and will set out for the Rio Grande in a few days with the volunteers from the United States . ''