 Arriving at San Diego on 15 February 1919 , Yorktown was placed out of commission at Mare Island on 12 June 1919 . On 17 June 1920 , she was assigned the hull number PG @-@ 1 . The veteran steel @-@ hulled gunboat was sold to the Union Hide Company of Oakland , California , on 30 September 1921 ; she was broken up in Oakland sometime after that . 
