Yup Churchill himself may be quoted often, but he wasn't averse to paraphrasing and nicking bits from quotes himself. Probably his most famous quote, which inspired the nickname for the Battle of Britain pilots, i.e. the one about 'so much being owed by so many, to so few', was certainly a tweek of Shakespeare's St Crispin's day speech from Henry V: 'We happy few, we band of brothers'.
Chock