convoy vs gang up with

convoy

verb
  • To travel under convoy. 

  • To escort a group of vehicles, and provide protection. 

noun
  • The act of convoying; protection. 

  • A group of vehicles travelling together for safety, especially one with an escort. 

  • One or more merchant ships sailing in company to the same general destination under the protection of naval vessels. 

gang up with

How often have the words convoy and gang up with occurred in a corpus of books? (source: Google Ngram Viewer )