He wrote the story with his friend's 'assistance'. = He wrote the story 'with the assistance of' his friend. [=his friend helped him to write the story]
Our family had to 'go on public assistance' [=receive money from the government] when my parents lost their jobs.
Nobody 'came to her assistance' [=nobody helped her] when her car broke down.
(..) - Not as fun as I remember. - Shoot the control box. - Columbus. - Tallahassee. - I think they might actually require our hard assistance this time. - Buckle up. - Yup, I'm wide ahead of you. Time to nut up or shut up. Holy shit. My mama always told me, (..)2009 Zombieland