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.
(..) to contract work. You can't put a price on being able to live with yourself. Tripoli, we need immediate assistance. These assholes have no idea what's coming for them. Shit. You got to be fucking kidding me. I lost my contact. (..)2016 13 Hours
(..) Tripoli, Benghazi is under attack. The Ambo is in the safe haven. We need immediate assistance. Magariaf pick up the phone yet? I got Op Center at State in D.C. U.S. Military (..)2016 13 Hours