Noun
A vessel built or fitted for the conveyance of troops; a transport.
Source: Webster's dictionaryBefore the war she had been the German liner Vaterland, but the start of hostilities found her laid up in New York Harbor and she had been seized by the US Government in 1917 and converted into a troopship. Source: Internet
She was used as a troopship from 1818, was placed on harbour service from 1824 and was broken up in 1845. Source: Internet